RE Truman:
That may indeed be a correct assumption. Democrat Truman was nothing like today’s communist-riddled democrats.
But... he DID inherit all of FDR’s leftover moles and Soviet spies, so who knows what was in his head.
I’d wager, though, that one Fat Man dropped on the heads of 300 thousand Red Army “People’s Volunteers” crossing the Yalu would have ended the Korean War REAL soon and saved a lot of American and Korean lives.
You may very well be right about the effect of just one more atomic bomb (in Korea), after all we had plans for a third atomic bomb run on Japan had they not surrendered, the honored B-29 was known as the ‘Great Artiste’, and it was bound for Tokyo and the seat of government.