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.
Unlike yourself I’ve actually studied Japanese history under both the Shogunate and under Meiji. But, why would that matter? We all know Japanese don’t have souls and they always obey their masters.
Japanese history didn’t begin with Tojo and end with the atomic bomb. Yes, there were many who desired war. Assessing Germany by Hitler makes about as much sense as assessing Japan by Tojo.
But anyways, go ahead. Tell us how the Japanese no longer had a will of their own...