I fault dwight for giving in and not finishing it and the world community as whole for quiting, although in the wake of WW2 the lack of appetite for armed conflict is understandable.
The Eisenhower Administration inherited the war, the situation is one that has never changed; the risk of all out war was and is having to fight China and back then also Russia.
The big mistake was made during the 90s when NK was allowed to gain the capability for nuclear weapons, the politicians that made those decisions have a big D after their names. It is very unfair to blame Dwight or Donald for someone's else mess.