Agreed. It is in victory where honor matters most. In naval circles there is a principal that a ship be sunk, not punished. (Shots not below the waterline meant to kill the crew rather than sink the ship and allow the crew to abandon.) Some say Bismark was punished. Walling off Japan and bombing it conventionally would have been punishment. Once the enemy is down, the victor has a duty to construct an endgame.

But imho the bombs are still overplayed as war-enders. I think the prospect of invasion and occupation by Russian forces had at least as much of an impact on the decision.