Straggler points out, among other things, that we should not:
forget that post WW2 America engaged itself in superpower supremacy and the arms race with the USSR.
In fact, I am fairly sure that nuking Hiroshima & Nagasaki were also, in the eyes of the top military US officials all the way up to Truman, "convenient" demonstrations to the Russians that the US also had their ass, should they ever get out of line.
Of course, soon after, the USSR got the bomb, too, and the MAD escalation began.
- xongsmith, 5.7d