It was certainly the case that the U.S. could not cure all the evils in the world in fighting the Nazis with the Soviet Union as an ally.
What do you think the world would have looked like for the last seventy years if Hitler had not attacked the Soviet Union? Eventually Hitler would have taken on the Soviet Union, but he might have consolidated his gains in Europe and subjugated the British first.
“Eventually Hitler would have taken on the Soviet Union, but he might have consolidated his gains in Europe and subjugated the British first.”
Hitler had no designs to rule the world, only Europe; no aircraft carriers, few long-range bombers, no power to project. How Stalin was a preferable alternative is beyond me; before the war started he’d already killed millions. It was a war between 2 evils; no reason for the US to do anything but clean up after they’d reduced each other to nothing.