He wanted nuclear bombs in NK and China.

Do you have a citation for that? The only sources I've seen have said that others suggested offensive use of nuclear weapons, then scapegoated MacArthur when the studies were leaked/released to the public.

I maintain that the second greatest mistake the US ever made was not giving McArthur the bombs he wanted.

What's your number one mistake then? Not nuking Russia in 1945 or asking Stalin to help out in Asia?

What you are referring to is allowing MacArthur to have nuked China when they entered the Korean war, aka killing millions of civilians and leaving the eastern seaboard of China irradiated for generations. We should be glad he was kept on his leash.

MacArthur repeatedly rejected suggestions for such use of nuclear and chemical weapons, stating that he would only use them to prevent an ultimate fallback. It seems that others, such as Bradley, Ridgeway, Truman, and even Eisenhower were more in favor of escalation than MacArthur, who seems to have been made something of a scapegoat upon his dismissal.

https://en.wikipedia.org/wiki/Relief_of_Douglas_MacArthur#Nu...

Sidenote: I am not a MacArthur 'fan', but he was a very complex character

> leaving the eastern seaboard of China irradiated for generations

It might depend on the particular warhead, but this was not the case for Hiroshima and Nagasaki...

The nukes we had by korea were much larger