[XBokuNoKuraiMayuX]

Consider that even though the U.S. tried persistently to tell the Japanese that they(U.S.) would use deadly measures, the Japanese refused to respond. And I agree with the person before me who said that it would have been a much heavier loss to not just Japan but the United States as well, dropping the A-Bomb and killing only 200k as opposed to some more million and going on a scale war with Japan in their own mainland. Consider the likely outcome: The Japanese are very very respectable to their homeland, so countless civilians would have attacked the intruders(U.S. forces in Japan) and the US would have no other way to stop them unless they either shot them or put them down somehow. That would be a much more bloodier outcome and would have been much more costly in the number of people lost.

On a somewhat different side of the story, the US could have made the damage and devastation multiply by much more if they aimed it towards a bigger city such as Kyoto or Nagoya or even, Tokyo.