What the USA and her allies did during WWII was RIGHTEOUS. The Axis powers asked for the grief they got, and while innocent civilians always get hurt or killed in wars, I'd always much later it be the enemy's civilians than ours. No way should anyone in this country feel guilty for doing what it took to win the war, and if only the military was still allowed to, oh, fight an actual war instead of being hampered by hand wringing politicos and wacked out libs, we'd have won 'Nam and been out of Afghanistan and Iraq by now.
Most victor nations would have ground the Germans and Japanese neck deep in the morass of defeat. We spent billions of dollars to rehabilitate them.