If you were firebombed or killed in a human meat wave in Stalingrad you are just as dead as someone killed with big bomb.

I think the moral argument about killing more and more Americans or Japanese during an invasion is a fun theoretical discussion, but in a war your people matter and the enemy’s don’t in cases like this where you have two clear nation states engaged in total war. Certainly the circumstances of the wars matter, but in the case of World War II I think it’s rather clear cut, and opinions to the contrary are generally revisionist history meant to continue to make America look like a bad guy in order to cause moral confusion and social division.