As I recall McArthur wanted to take the war into N.Korea after Inchon but Truman was concerned with China and backed away. History has yet to define who was correct as to US interests.
I didn’t grow up during the Korean War. If I had, I might be able to judge that better. Seeing what historians have done with the history of Vietnam, I wouldn’t trust reading about it.
Whether the decisions between Ike and McArthur were right, would be difficult to assess. We’ve had 60 years of relative peace there. That’s probably the best you could hope for.
With it’s nuclear weapons program, we still may see North Korea rear it’s ugly head in an ugly way though