JFK was elevated to saintlike status and nobody can live up to that.
His behaviour towards his wife and other women does, on the face of it, seem rather unpleasant.
I was more disappointed to hear in a documentary about Sammy Davis Jnr that, after campaigning hard for JFK, SDJ was not invited to his inaugural ball since JFK feared there would be a white backlash because SDJ had married a white actress.
We think of presidents being very powerful but I'm sure they can be destroyed quite easily if they upset the wrong people.