If I'm not mistaken Japanese were willing to kill themselves non-stop until they won (Pearl Harbor) so America used their most powerful weapon to shut them down.
English
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That was early on in the war. By the time we had the nukes, most of the general populace was opposed to continuing the war. A blockade would have done just as well without the casualties.
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Many of the citizens wanted to stop but their leader wouldn't stop.
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Wasn't even their "leader". Hirohito was opposed to the war from day 1. It was the other politicians who were threatening a coup.