The principle of democratically elected civilian leadership of the military in the US was the issue, not a specific military strategy in the Korean peninsula.

The principle of democratically elected civilian leadership of the military in the US was the issue, not a specific military strategy in the Korean peninsula. MacArthur undermined the chain of command. That's why he was relieved. Full stop. It's too bad how it work out for all parties involved, particularly the people of North Korea.