If you are referring to JFK as a “good” President, I disagree.
JFK completely abandoned the Bay of Pigs invasion of Cuba after promising air & other support. His weakness encouraged the USSR to station ballistic missiles in Cuba, causing the Cuban Missile Crisis & almost starting WWIII. Beyond that, he was a serial cheater in his marriage.
JFK was a pretty face & that is about all there was positive about him. Had he lived to an old age, I am sure we would detest him as much as his drunken brother Ted.
I’ve read a lot of books about the Kennedys, and it seems to me that they peaked collectively when JFK became president. After that, it was downhill, and their decline got a lot faster after Joe Sr. had a stroke. He was the brains of the outfit, totally unscrupulous but pragmatic. After he was out of the picture, his sons started making really big blunders. For example, if it had been up to Joe Sr., Bobby would never have gone after the mob, because the price of alienating them was too high.
He did lower the capital gains tax and put Byron WHIZZER White on the Supreme Court. I wish all Dems were that “bad”, we would have a great country.