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That's a good question. It's one thing to sit out on the deck and engage in a bit of moral preening with your coffee and smart phone; and quite another to face the prospect of sending your sons or nephews off to die in the South Pacific or Japan or wherever. They called it a 'world war' for a reason.
No doubt, people just wanted to end the damn thing. It's unfortunate what happened at Hiroshima. But so was Pearl Harbor. Japan could have prevented Hiroshima by not attacking us in the first place.
It's kind of a bunny trail, supposing Japan didn't strike first it's possible the US would have stayed out of it and Europe would fallen to the Reich. Funny how things work out.
These little second-guessing ventures are interesting but it's all academic.
There's also a good chance that a large part of China would now be under rule by Japan and the old Japanese social structure would still be in place.