“Japanese civvies showed nothing but obedience to their masters.”
Right, that’s because the Japanese have no souls of their own, eh? /sarc
I don’t believe this for a second.
There doesn't seem to be an aversion to killing civilians in this argument as much as there is an aversion to killing them efficiently, dramatically, in a way that saved the POWs and hastened the close of hostilities. In short, it is a nonsensical argument that ignores the truth on the ground at the time, a re-write of history.