Your grandad has filled your head with garbage.
Macarthur was the only voice of common sense. He opposed the formation of the UN, and intended to clear the communists out of east asia.
Truman would have none of it. Truman was responsible foe many of the failures, including in the Plilippines, where he kept a logisstic leash on all operations for no good reason.
TV was used skillfully by the globalists to defeat Mac in ‘52. I watched it, and it made me sick, and I was just a kid.
The anti-Macarthur forces are responsible for the mess in Korea and the rest of asia that we have today.
When we invaded the Philippines, Truman was a senator from Missouri, campaigning to be elected VP.
Either Mac and Nimitz called a Missouri senator to receive their strategy directives, or, you fail history.