Moreover, isn't Truman the darling of the Left because he fired McCarthur?
Yes, that's true. However, McArthur didn't fire Truman, which is Krauthammer's point. Civilian control of the military is one of the cornerstones of our republic.
True. But during the Korean War McCarthur wanted to cross the Yalu into China and kick commie butt. Truman wouldn't let him.
The left has always stood against American assertiveness.
Apples and oranges.