The atomic bombing of Japan at the end of World War II is often called one of the great crimes of the last century. Many people treat it as an undeniable fact that dropping the bombs was morally and ethically wrong, self-evident to any thinking person. The two cities were destroyed, somewhere between 130,000 and 200,000 people died, and a great many of them were civilians. Stated that way, the conclusion seems obvious.
I enjoy examining such “obviously self-evident” truths to determine for myself, without bias, the facts surrounding the circumstances, and to come to my own conclusions. And when you look at the actual situation the decision-makers faced in 1945, the picture stops being simple very quickly.
On the surface, killing nearly 200,000 people in two flashes of light is plainly wrong. But the ethics of a decision are rarely judged by its cost alone. They are judged by the cost measured against the alternatives. And in the summer of 1945, every single alternative on the table was worse, most of them catastrophically so.
To understand the decision, you have to understand the moment. A long and staggeringly expensive war had been fought across the planet. Fifty to sixty million people were already dead. The war with Japan was getting bloodier, not gentler, as it approached the home islands. Iwo Jima and Okinawa had just shown the Allies exactly what invading Japanese soil would cost. On Okinawa, the casualty rate ran around thirty-five percent, the Japanese fought nearly to the last man, and tens of thousands of civilians died, many by suicide rather than capture.
The Invasion That Was Actually Being Planned
The alternative to the bomb was not peace. It was Operation Downfall, the planned invasion of the Japanese home islands, and it would have been the largest amphibious operation in human history. It would have made the Normandy landings look like a rehearsal.
The first phase, Operation Olympic, was scheduled for November 1945 and would have put around 767,000 American troops onto the beaches of Kyushu. The second phase, Operation Coronet, planned for the spring of 1946, would have landed over a million more near Tokyo. American planners were, by their own later admission, badly underestimating what they were walking into. Code-breaking intelligence over the summer of 1945 kept revealing more and more Japanese defenders massing on Kyushu, hundreds of thousands of them, exactly where the Americans intended to land. The Japanese had correctly guessed the invasion site and were reinforcing it.
The casualty projections climbed as the intelligence came in. One April 1945 estimate put total American casualties for both operations at 1.2 million, including 267,000 dead. A later study estimated the conquest of Japan could cost between 1.7 and 4 million American casualties, with 400,000 to 800,000 dead, and somewhere between 5 and 10 million Japanese deaths, because Japan was mobilizing not just its army but its civilian population, arming them with whatever was at hand and training them for guerrilla resistance. The United States manufactured roughly 500,000 Purple Heart medals in anticipation of the bloodshed. They are still being issued today, eighty years later. That is how many casualties the planners expected.
And the invasion was not even the worst-case path. The United States was fully prepared to use chemical weapons against Japanese fortifications and was developing plans that contemplated using additional atomic bombs in direct support of the landings. The “clean” alternative to Hiroshima existed only in hindsight. There was no clean alternative on the table in 1945.
The Blockade and the Famine
Suppose the invasion had been called off and the United States had simply tightened the noose instead, relying on the naval blockade and the aerial mining campaign already underway, grimly code-named Operation Starvation. This is sometimes presented as the humane option. It was not.
By 1945, the average Japanese citizen was already living on roughly seventy-eight percent of the minimum caloric intake needed for basic health. The blockade had cut off food and fuel imports almost entirely. The 1945 rice crop had failed. About half of Japan’s seventy-two million people lived in a food-deficit region that depended on shipping and rail that the United States was systematically destroying. Experts of the time predicted that if Japan had somehow found the will to keep fighting into 1946, deaths by starvation would have exceeded seven million.
That is not a humane alternative. That is a slower, larger atrocity, measured in millions rather than hundreds of thousands, spread out over a year of mass civilian death by hunger. The famine of 1946 was only prevented after the surrender, when the United States shipped in enough food to feed somewhere between fifteen and twenty million Japanese city dwellers month after month. Occupation authorities later estimated that American food aid saved around eleven million Japanese lives. Those are lives that the blockade, left to run, would have taken.
The Soviets, and a Divided Japan
There is one more alternative that almost never gets mentioned, and it may be the most important. The Soviet Union declared war on Japan on August 9, 1945, the same day as the second bomb, and immediately began rolling through Japanese forces in Manchuria. Stalin had plans to invade Hokkaido, the northernmost home island, and only canceled them under American pressure and his own high command’s doubts.
If the war had dragged on for months or years longer, the Soviets would have been full participants in the final campaign. The result would have been a divided Japan, exactly as we got a divided Germany and a divided Korea, with a Soviet-occupied north and an American-occupied south. We know what that looked like everywhere else it happened. We can see the difference to this day by simply comparing South Korea to North Korea. And we know how Soviet occupation treated Japanese prisoners on the Asian continent, where 400,000 to 500,000 Japanese died in Soviet hands after hostilities had formally ended. A Soviet occupation of half of Japan would have produced its own mountain of corpses and locked the country into the same kind of frozen, miserable division that trapped Korea for generations.
The swift end of the war prevented all of that. There is no divided Japan. There is one Japan, which rebuilt into a peaceful, prosperous democracy and a close American ally within a generation.
The Firebombing Nobody Talks About
Here is something worth sitting with. The horror people feel about Hiroshima and Nagasaki is partly about the death toll, but it is mostly about the fact that the weapon was nuclear. The word “atomic” carries a dread all its own. But strip away the novelty of the technology and look only at what was actually done to civilians, and the atomic bombs were not even the worst air attacks of the war. Not by a wide margin.
On the night of March 9 and 10, 1945, five months before Hiroshima, the United States sent roughly 300 B-29 bombers over Tokyo and dropped more than 1,600 tons of napalm and incendiaries on a densely packed residential district built almost entirely of wood. The raid was code-named Operation Meetinghouse. The planners had chosen a dry, windy night on purpose, to make the fire spread. It worked. A firestorm consumed roughly sixteen square miles of the city, an area comparable to half of Manhattan. The Japanese remember it as the Night of the Black Snow.
In a single night, somewhere between 90,000 and 100,000 people were killed, the overwhelming majority of them civilians: men, women, and children burned alive or asphyxiated as the fire pulled the oxygen out of the streets. Another 125,000 were injured. More than a million were left homeless. It was, and remains, the single most destructive air raid in human history. The death toll that one night exceeded the immediate toll of Nagasaki, rivaled or exceeded that of Hiroshima, and by some estimates killed more people than both atomic bombs combined in their initial blasts.
And this was not a one-time event. It was the opening of a campaign. Over the following months, American bombers firebombed more than sixty Japanese cities the same way. Earlier, in Europe, Allied bombing had done the same to German cities. The firebombing of Hamburg in 1943 created a firestorm that killed tens of thousands in a single operation. Dresden, in February 1945, killed around 25,000. These were horrific by any measure, and they were carried out with entirely conventional weapons, the kind nobody signs treaties to ban.
So here is the uncomfortable question. If the moral objection to Hiroshima is the mass killing of civilians, then the firebombing of Tokyo was worse, and it happened first, and almost no one talks about it. There is no famous museum to Operation Meetinghouse. Most Americans have never heard of it. The reason Hiroshima and Nagasaki occupy a unique place in our moral imagination is not really the body count, because the body count was matched or exceeded by fire. It is the radiation, the mushroom cloud, the sense that humanity had crossed a threshold into a new kind of weapon.
That dread about the weapon is legitimate. Nuclear arms are a category of horror all their own, and the world has spent eighty years trying to keep that genie in the bottle. But it should not distort the moral accounting of August 1945. By the time the atomic bombs fell, the United States had already been killing Japanese civilians by the tens of thousands per raid for months, with fire. The atomic bombs were more efficient, not more lethal, than what was already happening night after night. Anyone horrified by Hiroshima who has never given a second thought to Tokyo is reacting to the technology, not to the deaths.
Before You Decide America Was Uniquely Monstrous
There is a habit, when this subject comes up, of treating the United States as if it were the sole villain of 1945, a nation that committed an unspeakable act against an essentially passive victim. That framing requires you to forget almost everything else that was happening in the world at the time, and in particular it requires you to forget what Japan itself had been doing for the better part of a decade.
Japan called its empire the Greater East Asia Co-Prosperity Sphere, a phrase dressed up to sound like mutual benefit. What it meant in practice was the conquest and brutal subjugation of much of Asia. In China alone, an estimated fifteen million people died as a result of the Japanese invasion and occupation. That is not a typo. Fifteen million, the great majority of them civilians.
The Rape of Nanjing is the example most people have at least heard of, and it deserves to be remembered. Over roughly six weeks beginning in December 1937, the Japanese army murdered somewhere between 100,000 and 300,000 Chinese civilians and prisoners in a single city. Tens of thousands of women and girls, ranging from children to the elderly, were raped, and many were killed afterward. A third of the city was burned. This was not a battle. The city had already fallen. It was a massacre carried out against people who could not fight back.
And Nanjing was not an aberration. It fit a pattern. Japan ran a covert biological and chemical warfare program, the infamous Unit 731, that performed lethal human experiments on prisoners the staff referred to as “logs,” and that deliberately spread plague and cholera among Chinese civilians, killing hundreds of thousands more. Japan forced enormous numbers of women across occupied Asia into sexual slavery under the euphemism “comfort women.” Japan marched prisoners of war to death, worked them to death in labor camps, and starved them by policy. The 400,000 to 500,000 Japanese who later died in Soviet captivity were a fraction of the toll Japan itself had inflicted on everyone within its reach.
I raise this not to argue that two atrocities cancel out, and not to claim that the people of Hiroshima and Nagasaki personally deserved what happened to them. I cannot say they deserved it. The civilians who burned in those cities were, for the most part, no more responsible for Nanjing than the civilians who burned in Tokyo were responsible for Pearl Harbor. Mass death is mass death, and I am not interested in keeping a scoreboard of suffering.
The point is narrower and more honest than that. You cannot talk about the Americans being wrong without also talking about the Japanese being wrong, and the Germans, and to one degree or another nearly everyone who fought that war. It was a global conflict in which essentially every major participant did monstrous things, from individual soldiers all the way up to the leaders who gave the orders. The firebombing of cities, the massacres, the camps, the medical experiments, the starvation as strategy. This was the character of the entire war, on all sides. Singling out one weapon used by one country on two days, while ignoring the ocean of brutality surrounding it, is not moral clarity. It is moral selectivity.
And here is the hard truth underneath all of it. In an all-out war, the kind where you are watching thousands and possibly millions of your own people die, mercy is not a strategy anyone in charge can afford. Every government in that war reached the same conclusion. The question facing American leaders was not “how do we fight this war ethically,” because by 1945 that ship had sailed for everyone. The question was “how do we end it as fast as possible with the fewest of our own people dead.” Measured against that question, and against the alternatives already described, the bomb was not an act of unique cruelty. It was the same logic everyone else in the war was operating under, applied with a more powerful tool.
A Word About the One Document Everyone Cites
If you argue any of this in public, someone will eventually wave the United States Strategic Bombing Survey at you. The Survey’s 1946 report on the Pacific included a now-famous passage claiming that Japan “would have surrendered even if the atomic bombs had not been dropped, even if Russia had not entered the war, and even if no invasion had been planned or contemplated,” probably before November 1945 and definitely by that December. For decades this single sentence has been treated as the final word, the authoritative proof that the bombs were unnecessary.
It is worth understanding what the Survey actually was before you let it settle the argument. The Strategic Bombing Survey was an institutional self-evaluation. It was a body assessing the value of America’s bombing campaigns, and it had an obvious stake in the conclusions it reached about its own work. That alone should make you read its claims with one eyebrow raised. An organization grading its own homework is not a neutral authority, and the historian Robert Newman, who examined the Survey’s reasoning in detail, did not mince words. He called its “Japan would have surrendered anyway” conclusion fraudulent. Even defenders of the document now concede it should never have been treated as the unimpeachable authority it became.
Look at how that conclusion was reached and it gets worse. The claim rests on a counterfactual, a guess about what would have happened in a version of history that never occurred, which by definition cannot be tested or proven. And the evidence offered for that guess was the postwar testimony of surviving Japanese leaders, the very men with the strongest possible motive to claim, after the fact, that their nation had been on the verge of a noble surrender all along and that the destruction visited upon them had been gratuitous. You are being asked to accept an untestable hypothetical, vouched for by the losing side, packaged by an agency rating its own performance. That is not evidence. It is an assertion wearing the costume of evidence.
And notice what the same conclusion quietly assumes. The Survey’s scenario for surrender without the bomb assumed the conventional firebombing would simply continue, the same firebombing that had already killed 100,000 people in Tokyo in a single night. So even the rosy “they would have surrendered anyway” case was really a case for keeping the cities burning a few more months. There was no version of late 1945 in which Japanese civilians stopped dying. There was only the question of how, and how many.
I do not accept the Strategic Bombing Survey as the last word on this, and neither should you, at least not without reading it as critically as you would read anything else written by people evaluating their own decisions. I have looked at it. I came to my own conclusion. That is the whole point of this exercise.
My Conclusion, and Yours
I cannot make the moral or ethical choice for you. What I can say is that the people who treat this as a simple question, an obvious crime committed by a callous nation, have usually not looked at what the alternatives actually were. Every other road out of that war led to more death, not less. The invasion, the famine, the Soviet partition, the prolonged fighting. Each one killed more people than the bombs did.
If I had been in charge in 1945, with the information available at the time and the alternatives spread out in front of me, it would have been an agonizing decision. It should be agonizing. But “agonizing” is not the same as “obviously wrong,” and anyone who finds it obvious has probably skipped the part where you count the bodies on every other path.
Read the history yourself, dig into the sources, and come to your own conclusion. That is the only honest way to hold a view on something like this.
There are voices which assert that the bomb should never have been used at all. I cannot associate myself with such ideas. I am surprised that very worthy people, but people who in most cases had no intention of proceeding to the Japanese front themselves, should adopt the position that rather than throw this bomb, we should have sacrificed a million American and a quarter of a million British lives.
— Winston Churchill, speech to the British House of Commons, August 1945
