Spur is 100% correct. Maybe it is just our culture because we see the atomic bomb as the big bang in WWII, but we caused so much destruction in incendiary bombings in Tokyo.
There is a museum at ground zero in Hiroshima which is dedicated to the history of the causes/effects of nuclear war, along with historic artifacts such as replicas of the bombs, pictures, watches that stopped, etc. I really am glad I went.
However, there are many Japanese who are angry at the construction of the museum due to none being constructed in memory of the Tokyo victims. Where is their legacy?
So in my opinion (and that's all it is, an opinion), the nuclear bomb was the 'more' humane way to go.