The choice isn’t between living in a world with or without nuclear weapons; it’s between living in a world where we dropped the bomb on Hiroshima and Nagasaki or one in which it was dropped by someone else somewhere a few years later.

And then the question is more complicated. All things considered, dropping the bomb on Japan was a pretty good way of it going.

There is no more virtuous war than WW2. Germany and Japan were bad. They were murderous aggressors that had to be stopped. The worst weapon in history was being chased by a bunch of different combatants in this very morally one-sided war, and using that weapon ended it, with destruction that could not be immediately matched, so humanity had time to be appalled and establish a taboo on further usage.