How is nuking Japan different from nuking Korea? Everybody agrees that forcing Japan to surrender with nukes was much better for everyone involved than a ground invasion.
When Japan was bombed, nobody else in the world had nuclear weapons, the US only had 2, and there were only a handful of people outside of the US seriously researching nuclear weapons and were still years away from a test. By 1950 the USSR had working nuclear bombs, had proven so with a nuclear test, and a dozen other countries had started their own nuclear weapons programs.
