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