David Zimmerman asks what I have in mind in calling Kennedy more dangerous than Nixon. Let me explain. Kennedy brought us terrifying close to a nuclear war with Russia in the so-called Cuban Missile crisis by his reckless machismo confrontation with Khruschev. Nixon never did anything remotely that dangerous. We got lucky, thanks in no small measure to Khrushchev. In the end, Nixon did more harm than Kennedy, but Kennedy was more dangerous.
Would Kennedy have pulled us out of Viet Nam, having gotten us in? We will never know. But I think we do know that Johnson did not want to get deeper into that region militarily and was persuaded to do so by the "best and the brghtest" who had been advisors to Kennedy and whom Johnson inherited when Kennedy was killed.
I freely acknowledge that the Cuban Missile Crisis scarred me for life, and my judgment may be skewed by that fact.