Yes. Stalin's Great Purge had already occurred when the US decided that Hitler was a greater threat to the world than Stalin. We made the right choice. After Hitler was gone, we appropriately focused our efforts taking down Stalin.

Yes. Stalin's Great Purge had already occurred when the US decided that Hitler was a greater threat to the world than Stalin. We made the right choice. After Hitler was gone, we appropriately focused our efforts taking down Stalin. It's the principle of Triage.