Kennedy had enemies for other reasons. There was a sarcastic maxim at the time, "What's the road to the White House?" Answer: "Go to Harvard, then turn left."
When Kennedy had the president of United States Steel summoned to the White House like a dog to receive a tounglashing for increasing steel prices, it created a lot of anger in the business and other communities. Kennedy was a heavy-handed leftist when it suited his purposes. I lived through the period. There is little now written about Kennedy that I recognize from the period.
To paraphrase a Reagan quip, I remember John Kennedy and believe me John Kennedy was no John Kennedy.