He did that aged in his 60s with island hopping strategic brilliance.
(That was Nimitz...Mac was in his way)
In his 70’s he was again strategically brilliant with calculated risk at Incheon.
(That was the US Navy and Marines... though the pop culture iconography was that they were not behind it and it was the genius of MacArthur alone who taught the USMC and Navy about amphibious attack)
And he was openly insubordinate to President Truman.
Last, that lunatic also defied the direct orders of President Hoover and attacked and burned the WWI bonus marchers camp. He had cavalry attack them and beat them with the backs of their swords.
MacArthur should have been left for capture on Corregidor.
And his defense of the Philippines was utterly incompetent. he surrendered to a Jap force a third his size after that incompetent defense.
Speculation.
I never cease to be appalled at the degree to which the Left has brainwashed conservatives about MacArthur.