The Atlantic‘s Jeffrey Goldberg spent some time with the Cuban leader a few years back and asked him exactly that question.
Unlike some JFK conspiracy theorists who portray Castro as a demonic puppet master who somehow manipulated Oswald, Goldberg conveys a sense of the man who bedeviled Washington with his defiance of U.S. domination but who also sensed JFK was open to the mutual respect that still eludes the two countries after fifty years.
“I then asked Castro to tell us what he believes actually happened. I brought up the name of his friend, Oliver Stone, who suggested that it was the CIA and a group of anti-Castro Cubans (I used the term “anti-you Cubans” to describe these forces aligned against Castro) that plotted the assassination.
“Quite possibly,” he said. “This is quite possibly so. There were people in the American government who thought Kennedy was a traitor because he didn’t invade Cuba when he had the chance, when they were asking him. He was never forgiven for that.”
“So that’s what you think might have happened?
“No doubt about it,” Fidel answered.