While Detroit is a wasteland:
Ironically, it was Democrats that destroyed both cities. In Detroit's case, it took fifty years instead of fifty seconds. I guess the expansion of bureaucracy slowed things down quite a bit.
As for Hiroshima and Nagasaki, even though Japan was beaten and willing to negotiate a surrender, Truman decided to drop The Bomb on them.
You can argue the morality of this forever but the lesson is this: when you start a war, any consideration or compassion from the people you attacked, for your people , is forfeit.
Estimates for the number of American lives saved by The Bomb vary from two hundred thousand to one million. I don't care if the number was one, I'd rather see one American soldier come home at the expense of thousands of enemy civilians than send a million of our troops into a meat grinder.