And your belief that there was no state of war between the U.S. and Japan before Pearl Harbor is delusional at best, and deceptive at worst. Do some research on a guy by the name of Claire Lee Chennault. The U.S. military had drafted plans to bomb Japanese cities from mainland China before December of 1941, and began shipping the aircraft and munitions there in October of that year.
Compared to the firestorms in other Japanese cities from incendiary bombs, the Atomic Bombs were simply more efficient, although their production more or less negated that efficiency.
Hiroshima and Nagasaki were valid military targets. Fact.
Any reservations about the use of our Atomic Bombs is absurd. In the end, their use finally pushed the Japanese to capitulate. Millions of lives on both sides of the war were thus spared. Fact.
We have war plans to invade Canada in the Pentagon today, unless our General Staff is completely incompetent.
We were simply not in a state of war with Japan before Pearl Harbor. And yes, I know who Chennault and the Flying Tigers are.