I’ve heard that JFK would not have escalated the Vietnam War the way LBJ did.
I’ve heard many of the great society programs were passed,based on honoring the memory of JFK. If JFK had not died, then who knows about those programs enacted.
Ditto with Ted Kennedy and the 1965 immigration law which was passed in JFKs memory.
I was serving with the U.S. Army Special Forces at the time JFK was shot, and I don't think JFK planned on making a stand against the Communists in Vietnam, as the French had already "Pissed in that well." We were fighting a delaying action in Vietnam while we prepared Thailand as the place where the "Domino" wouldn't fall, but when JFK was shot in 1963 and LBJ took over, that all changed in 1965.