Final answer:
The controversy surrounding President Kennedy's assassination was largely due to public skepticism about the official explanation, an unsatisfying report from the Warren Commission, and further intrigue after the killing of Lee Harvey Oswald by Jack Ruby.
Step-by-step explanation:
The controversy surrounding the assassination of President Kennedy stems mainly from public skepticism about the details of the assassination and the subsequent killing of Lee Harvey Oswald by Jack Ruby. The Warren Commission concluded that Oswald, who had been captured on the same day as the assassination after shooting President Kennedy from the Texas School Book Depository building, acted alone.
However, this report failed to calm public suspicion, leading to numerous conspiracy theories. Oswald's assassination by Ruby added to the disbelief, as Ruby offered no substantial reason for his actions, igniting further speculation about a potential broader conspiracy.
With Kennedy being a figure who was cautiously navigating politically sensitive issues like civil rights, it is believed he might have pursued more significant changes had he not been assassinated, further fueling speculation about motives behind the assassination.