it was intentional killing of innocent civilians
i don't care if japan personally raped and killed the moms of every us citizen, there is NO justification for knowingly partaking in actions that will 100% be guaranteed to kill innocent civilians that have nothing to do with the war
It does have something to do with the war. We could
A) perform an invasion, costing who knows how many lives of our soldiers and continuing to drag on the war
or
B) drop the bomb and end the war in a matter of days
Civilian casualties happen in wars. You attack population and industrial centers to hamper your enemy's ability to fight back. It's the reason we bombed German factories in the later stages of the war.