I don't really see how Hiroshima and Nagasaki were any more terrible on civilians than the "conventional" raids on Tokyo, Osaka, Nagoya, Yokohama, Kobe, and Kawasaki, not to mention other smaller cities in Japan. Estimates of the total of Japanese casualties range between at least 240,000 and go up to 900,000.
Coventry, London, Hamburg, Dresden, Shanghai, Nanking etc., what's the diff.?
Either declare them all (war) crimes against humanity or concede military necessity. There's little point in weighing scales being applied here (ours vs. theirs) or deeming one occurrence to be less bad than another.
Anyone think Air Marshall Harris was particularly concerned with civilian collaterals in German? On the contrary, he specifically targeted them in his morale bombing campaign. The objective incidentally failing.
Of the 500,000 civilian lives lost to Allied bombing, the lion's share perished from end 1944 to May 1945, a time by which Germany had conceivably had its pencil broken, its defeat being only a matter of time. Had little boy and fat boy been around in the middle of 1944, that period of the most intense bloodletting could probably have been avoided by using both to crush the last resolve.
Aerial bombing of cities comprising primarily civilians is not pretty and nobody ever said it was. But whether one dies in the flaming inferno caused by conventional incendiaries or by a nuclear blast of that time really makes no difference to those that perish.
Hiro and Naga taught a valuable lesson. Never to do it again especially when the others can do the same to you.
That, apart from the bickering about whose opinion is right on what strategies went thru the minds of planners then, is the most salient point.
To distinguish between good bombings and bad bombings is the most hypocritical aspect of the whole thread.