How is the issue different?
The Truman administration set policy, not McCarthur.
Besides, it was McCarthur's hubris that allowed him to get caught by suprise by the Chinese entrance into the war.
He ignored intelligence that showed a huge Chinese presence on the border.
Well let's not put ALL the blame on Mac:
Oct 12 1950 - CIA intelligence analysis asserts that Communist Chinese intervention in the Korean War is "not probable".
Oct 27 1950 - 300,000 Communist Chinese troops invade Korea.
NICE work.
During the Korean War the left backed the POTUS over the General. Today the left backs the Generals over the POTUS. In each case they backed the weaker less assertive American policy. Truman's reluctance to take on the Chinese (weak) they backed. Opposing Bush on IRAQ invasion (strong).