
John F. Kennedy is still a very popular figure in modern history. But looking at his legacy I can’t see any real political achievements. His main appeal seems to be his appeal: his drive and energy to revitalize a country and inspire it’s people.
Cuba and Vietnam are also not shining examples of good policy. He could avoid a full nuclear confrontation with the Soviet Union, but he also was part of inciting that dilemma in the first place (The Bay of Pigs and the blockade against the warheads for Cuban missiles).
The same is true with Vietnam. Neither McNamara nor Kennedy wanted to get into this conflict - but they did sent troops anyway.
His personal and moral record is hardly spotless either. President Clinton’s blowjob seem tame and boring compared to JFK’s many affairs.

One achievement I will applaud: the first treaty for limiting nuclear testing. Which paved the way for more and more treaties on arms control and nuclear disarmament. His engagement into the space program was less convincing, especially since it was just another aspect of the cold war fight - and an escalation.

If the real story behind his assassination can ever be uncovered - so will his true legacy. Maybe he pulled more important strings behind the scene or was truly fighting for a change in American culture?
As a symbol he shines, but as a mover & shaker he was mediocre.