That's why there are so many conspiracy theories regarding JFK, because they can't handle the truth that a Commie did it.
If you watch Cronkite during the assassination coverage, you know he so wanted it to be Right Wingers who did it, he mentioned over and over how Adlai Stevenson was "attacked" by right wingers in Dallas a few weeks earlier, as if to prove that the killer just had to be a Right Winger.