re: What is the worst thing that mankind has ever done?

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This has actually helped keep the world mostly peaceful since WWII. Without an atomic bomb, Russia and the US probably fight one of if not the most devasting conflict in history.

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Additionally, the Allies would have had to invade mainland Japan as they were not surrendering and we're prepared to fight to the death. That would have resulted in way more deaths than both bombs combined. Lesser of two evils ended the war.