The man admitted Khrushchev slapped him around, and then he started Vietnam after almost killing us in a nuclear war with Russia, the guy was an idiot in foreign policy.
Eisenhower and his vice president, weren’t.
With no JFK, the 1960s wouldn’t have become the destructive decade, Vietnam tore us apart, as did JFK’s immigration goals that became realized in 1965 which makes a coherent foreign policy increasingly impossible.
Vietnam started kicking up during Truman's term.
I think much to much is made of Kennedy's mistakes, (bay of pigs) or his actions..
Had Ho Chi Min been paid even the smallest amount of attention by the US when he sought help, things may have been different.
Kennedy’s participation or lack of it in Vietnam was not really the catalyst that led up to the war. In my view it was our political blindness as it applied to our French allies at the time.