I believe Truman was very correct to use the A-bomb against Japan. I believe he was also very correct not to use it against NK or China. I think there are many arguable reasons no country has used the A-bomb since WWII. But I believe one of them is that the USA and Russia have not used them. Sort of putting the gennie back in the bottle and not letting him out again. No one in his right mind wishes for the day we have nuclear weapons used again in a war. I think if we had done that, A-bombing our way across China, the Russians would have reacted, probably with the use of nuclear weapons as well. If Truman was wavering, and I doubt that he was, he could not releive McArthur and then advocate use of the A-bomb in a little 'police action.' And he had no choice but to releive McArthur. I don't know what possessed McArthur to be so insubordinate but there was no choice but to relieve him. And what a waste! He was both a great strategist and tactician, and a hero to the American people. I guess he just let his ego get away from him.