De Gaulle- properly protected. JFK- not

I've been listening to The Day of the Jackal on audiobook and this passage surprised me "The Jackal was perfectly aware that in 1963 General De Gaulle was not only the President of France; he was also the most closely and skillfully guarded figure in the western world. To assassinate him, as was later proved, was considerably more difficult than to kill President John F. Kennedy of the United States. Although the English killer did not know it, French security experts who had through American courtesy been given an opportunity to study the precautions taken to guard the life of President Kennedy had returned somewhat disdainful of those precautions as exercised by the American Secret Service. The French experts’ rejection of the American methods was later justified when in November 1963 John Kennedy was killed in Dallas by a half-crazed and security-slack amateur while Charles De Gaulle lived on…"

Tyler Newcomb: "My Dad had a quote from some French publication that when De Gaulle first heard the news from Dallas remarked "The Police did it" meaning his security because De Gaulle's own security had been penetrated by the OAS once or twice from what I remember."