Manchuria wasn't bombed until after the Chinese crossed the border and attacked UN forces. China came into the war on her own volition and wasn't attacked. Your comparison of Macarthur to Hitler is spurious at best and odious IMO. Macarthur didn't not seek a nuclear holocaust nor was there the remotest possibilty for one to occur since the Chinese weren't capable and the Russians were at an extreme disadvantage in that respect and wouldn't consider it anyway. According to them(at the time) they had nothing whatever to do with the conflict in Korea.