What you posted is bull.
And don’t forget the Bataan Death March or the horrible experiments the Japanese conducted on American POWs.
My father served in the Pacific (he’s still alive), and he’ll tell you what the Japanese did to the non-combatant natives he encountered on the various Pacific islands where he was stationed. He has no problems with the dropping of the bombs whatsoever.
If you prefer some other moral standard, go right ahead. You'll know what you're rejecting.