Think how many tens of millions would have died in such a war. Just for some other evil to pop up anyway.

Does any serious historian believe that fully defeating the Soviet Union after WWII would have been possible? Even with the advantage of nuclear weapons, I doubt the US would have made it very far.

It was way too late, look up Operation Unthinkable.

Grow an "ender" first. And when you do try - keep in mind that many tried before you. The Swedes. The French. The Germans. They all got their comeuppance, and so will you.

You mean when Churchill wanted to hire 100,000 "former" Nazis to invade the Soviet Union?