I would even agree that the Soviet Union was super evil, but I don't think it's worth the casualties of a major nuclear exchange to try to end it 40 years soone

I would even agree that the Soviet Union was super evil, but I don't think it's worth the casualties of a major nuclear exchange to try to end it 40 years sooner. And there's no way to be sure that a major nuclear attack would actually end the Soviet regime. Wouldn't the surviving Russians now think that America is not just a worrying rival, but a catastrophically dangerous enemy? Why wouldn't they unite behind the strongest regime they can make to defend themselves and strike back? AFAIK, quite a few Russians are still sympathetic to Stalin even today based on the idea that nobody else could have industrialized Russia fast enough and led with enough determination to resist the Nazi invasion. They lost millions of casualties and had huge swaths of territory occupied and destroyed and still went on to win the war. Do you really think they're just gonna give up after a few nukes? Also, try making a list of the biggest mass murders in history. Hitler and Stalin would be on the list. Also Mao Tse-Tsung. Possibly a few leaders of Communist regimes in SE Asia, depending on whether you look at the proportion of population killed instead of raw deaths. Do you want to see America at the top of that list? Based on a vague theory that the world would be better off somehow?