Maybe yes, but why not let him and Stalin beat each other senseless for a few years first? The Allies went to war over a free Poland, and wound up condemning it to a Soviet prison anyway.
Sure, and allow Hitler to gain nuclear weapons by allowing him to keep von Braun and others.
Uh, because he declared war on us on December 11, 1941?
You do know that Hitler declared war on the US right after Japan attacked the USA, right? Should the US have allowed him to destroy our ships with impunity for a pipe dream of Nazis ending the Soviet Union? And it is right to be morally outraged at the Soviet takeover of Central Europe; we should have said more sooner than we in the West did. But what would we have done militarily? Do you recall the “wanna go home” riots in the US military right after the war and how quickly the US tried to demilitarize its role in Europe?