Japan brought it on themselves. They were racist barbarians.
I believe Truman’s sincere motive was to shorten the war and save lives. Nevertheless, dropping bombs on cities with their civilian populations for the purpose of terror is and was a crime.
Problem with that is that Japan's civilian population was thoroughly integrated into its war machine at the time, with its cottage industry system of war production.
Nevertheless, dropping bombs on cities with their civilian populations for the purpose of terror is and was a crime.
Since when?
You win a war by destroying the will of the people to fight, or you destroy the people. There is no other way.
War is the systematic application of terror. War should be a last resort and not the first option. If there is no alternative, war must be terrible and a terror to be effective. It is ugly business to be avoided if possible.
What Truman did was not a crime.