I'm a lazy so I'll ask - Why were those two cities chosen.? It seems to me Truman could have bombed more populous areas if his only intention was to kill as many people as possible.
Kyoto was meant as a alternate target, but it was dropped at the insistence of Secretary of War Henry L. Stimson (it's believed the reason was that he had his honeymoon there). Kyoto was also a city of much greater historical value (as the former capital). Tokyo was avoided because the American government wanted someone to negotiate after they had nuked the cities. As for civilian loss, I think we more or less saw the maximum loss of human lives. The early nukes was less efficient weapons than we usual think, but Japanese cities was more or less "perfect" for high loss of lives, as they was much more crowded than European and American cities, and was build to large extent of timber. If a nuke had been thrown on a German city, we would likely have seen a much smaller loss of lives, thank to German cities being both less crowded and mainly build in bricks.
