The following article addressing the question of why was JFK assassinated is an excerpt from Mel Ayton's Hunting the President: Threats, Plots, and Assassination Attempts-From FDR to Obama.
A question that has persisted for over fifty years is this: Why was JFK assassinated? Theories abound over Oswald's motivation for assassinating Kennedy. In the 1980s, Jean Davison's Oswald's Game gave readers a logical explanation: the assassin was a wannabe revolutionary who worshipped Cuba's Marxist dictator Fidel Castro. According to Davison, Oswald likely acted out of a distorted sense of political idealism.
Why Was JFK Assassinated? Answering Conspiracy Theories
In recent years Vincent Bugliosi's Reclaiming History examined every theory and every conspiracy claim. The former Los Angeles lawyer, who became famous for his prosecution of hippie killer Charles Manson, took the debate about conspiracy allegations a step further by providing a devastating no-nonsense approach to the ridiculous assassination scenarios constructed by conspiracy authors, all of whom, as his book ably demonstrates, deliberately skewered the evidence in the case.
His book was a masterwork that decisively marginalized JFK conspiracists.
Why Was JFK Assassinated? A Simpler Explanation
Fifty years after Kennedy's assassination, there has not been any credible evidence showing that JFK's assassination was the result of a conspiracy. Sophisticated reenactments of the assassination using state of the art technology (computer models and laser-assisted weaponry) have shown that three shots were fired, all from behind and from the direction of the sixth floor of the Texas School Book Depository, where eyewitness Howard Brennan placed Oswald at the time of the shooting. The rifle and the pistol were traced directly to Oswald.
Spectrographic analysis of photographs purporting to show gunmen on a “grassy knoll” reveal only light and shadows. Neutron-activation analyses of bullet fragments support the single bullet theory, which was central to the single-assassin conclusion. A computer-enhanced version of the Zapruder film has confirmed that Oswald could have fired the three shots in the time sequence required. Ballistics experts have testified that Oswald's rifle was more than adequate for the job. Forensic pathologists and physicists have proven that the backward snap of Kennedy's head is consistent with a shot from the rear.
Incontrovertible evidence links Oswald with the murder weapon. And credible eyewitness testimony and circumstantial evidence established that Lee Harvey Oswald fired the shots that killed President Kennedy.