Cuba went communist because of him, World War 3 nearly happened because of him, the Vietnam War happened because of him, the fed bureaucracy became an entrenched monster because of him but hey he signed a tax cut so every republican should worship him.
Pah!
Castro came to power in Cuba in 1959 when Eisenhower was President. Whether a more competent US President than JFK could have freed Cuba from his dictatorship is something we will never know.