I want to know the answer to the following question:
What mistake did MacArthur make regarding the 38th parallel?
All the background I'm provided with is that "While MacArthur felt total victory was the only honorable outcome, Truman was more pessimistic about his chances once involved in a land war in Asia, and felt a truce and orderly withdrawal from Korea could be a valid solution.". Is that enough to answer the question?
Answer: no