In all fairness, he did serve honorably in the Navy so like him or not...
JFK did more than serve honorably. He served heroically.
It must not be forgotten that POTUSA Kennedy bucked the Fed Reserve monopoly on USA money. He had over 200 million dollars of USA Treasury notes printed to serve as legitimate currency exchange for USA citizens and I think backed by USA gold. Obviously the international bankers who are the real power of the misnamed /deceptive named Federal Reserve were upset by his audacity. I still have thoughts that his action caused his demise.
He and Nixon both did.
I have mixed feelings about JFK. He made some bad mistakes, like the Bay of Pigs.
He and Nikita Krushchev together almost bumbled us into a nuclear war, but fortunately Kennedy had the stones to face Krushchev down to a quid pro quo (Turkish missiles for Cuban missiles).