Don't forget the extremely hardline Vatican puppet Diem in Vietnam was assinated with this head of Security just 20 days prior (whose wife was very controversal also).

From the book 'Vietnam - Why did we go' by Avro Manhattan.

"John F. Kennedy, first Catholic president of the U.S. Kennedy, as senator, was part of the Catholic lobby which pushed for the installation of a Catholic president in South Vietnam. As early as 1954-55 he advocated military intervention to help the French hold back Communist advancement in North Vietnam. He was instrumental in the installation of Ngo Dunh Diem as Prime Minister. When Kennedy became President, he rapidly escalated the U.S. military involvement in support of Diem's Catholic regime. Later when Diem's persecution of the Buddhists began to draw fire from world opinion, Kennedy had to choose between supporting his church's effort or promoting his own political career. He chose to pressure Diem to let up on the persecutions. Diem's Buddhist generals seized the opportunity to assassinate Diem.

Three weeks later Kennedy himself fell to an assassin's bullet. This was so, not only because of the situation in Vietnam as a whole, and of South Vietnam in particular, but equally, because a no less portentous event, meanwhile, had occurred in the U.S. itself. The Kennedy Administration was taking over from President Eisenhower. Kennedy, the fervent Catholic lobbyist and supporter of Diem, set in earnest to promote the policy he had advocated for so long while still a Senator. It was no coincidence that as soon as he was in the White House, Kennedy escalated the U.S. involvement in South Vietnam. By the end of 1961, 30,000 Americans had been sent to Vietnam to prosecute the war, and thus indirectly to help Catholic Diem and his Catholic regime. A far cry from the mere 1,000 American advisors sent so reluctantly by his predecessor, Eisenhower. The result was that the "limited risk" gamble of President Eisenhower had been suddenly transformed into the "unlimited commitment" by the Catholic Diem sponsor, Catholic President Kennedy. It was the beginning of the disastrous American involvement into the Vietnam War.

Two Catholic presidents, Diem and Kennedy, had become the heads of two nations so intimately involved in a most controversial war. From the Vatican's point of view and the promotion of its plans in Asia were concerned, this had unlimited possibilities.

In different circumstances, the sharing of common religious beliefs might have helped in the conduct of a common policy, since the political interests of the two countries ran parallel. With Catholic Diem pursuing such anachronistic religious persecutions, however, Catholic Kennedy felt increasingly ill at ease, since he was too astute a politician to compromise his political career or to sacrifice the interests of the U.S. for the sake of a fellow Catholic who, after all, was incurring the opprobrium of the vast majority of Americans, most of whom still looked upon Kennedy's Catholicism with suspicion. Hence the Kennedy Administration's blessing upon the final overthrow of the Diem regime. But it is often the case with Catholics in authority that whenever the circumstances permit and there is no restriction by either constitutional clauses or other checks, they tend to conduct policy more and more consonant with the spirit of their religion. The result being that, by combining the interests of their country with those of their Church, more often than not, they create unnecessary social and political fields.

In the case of President Diem, when he put Catholicism first, he alienated not only the vast majority of South Vietnamese masses, but even more dangerous the greatest bulk of the South Vietnamese army, who on the whole had supported him politically. It was this, the potential and factual endangering of the anti-Communist front upon which Diem's policy had stood, that finally set into motion the U.S. military intervention, with all the disastrous results which were to follow. Although Diem remained as the U.S. political protégé, by pursuing a policy inspired by his own personal religious zeal, and by disregarding certain diplomatic and political interests interconnected with the general military strategy of the U.S., he had endangered a whole policy in Southeast Asia.

This became even more obvious, not only because of the exceptional restlessness which he provoked throughout the country, but above all, because his religious persecutions had seriously imperiled the effectiveness of the army. It must be remembered that the vast majority of the South Vietnamese troops were made up of Buddhists. Many of these, upon seeing their religion persecuted, their monks arrested, their relatives in camps, had become despondent, and indeed, mutinous. There were increasing cases of absenteeism, desertions, and even rebellions. The overall result of this was not so much that the religious war was incapacitating the Diem's regime itself, but even worse, that the military calculations of the U.S. were being seriously imperiled.

The whole issue, at this juncture, had become even more tragic, because in the meantime the U.S., had elected her first Catholic president, and even more so, because on the personal level, Kennedy himself, before reaching the White House, had been a consistent supporter of Catholic Diem. Indeed he had been one of the most influential members of the Catholic lobby which had steered the U.S. towards the Vietnam War. As the domestic and military situation inside South Vietnam went from bad to worse, the manipulators of Southeast Asia made it clear to him with the full support of the military authorities on the spot that something drastic had to be done to prevent the total disintegration of the South Vietnamese army. The mounting tension with Soviet Russia and Red China made a move from Washington imperative and urgent, since further internal and military deterioration might provoke the whole of the anti-Communist front to collapse from inside. The pressure became irresistible and the first ominous steps were taken. Subsidies to the Vietnam Special Forces were suspended. Secret directives were given to various branches closely connected with the inner links between the U.S. and the Diem regime.

Finally, on October 4th, 1963, John Richardson, the head of the CIA in Vietnam was abruptly dismissed and recalled to Washington. Certain individuals understood that they were given a free hand for a coup against Diem. A coup was successfully engineered, President Diem and his brother, the hated head of the secret police had to run for their lives. They were discovered by rebel troops hiding in a small Catholic Church. Having been arrested, they were placed in a motor vehicle as state prisoners. Upon arrival at their destination—both Diem and his brother had been shot to death. Their bodies were laid at St. Joseph's Hospital only a few hundred yards away from the Xa Pagoda, the center of the Buddhist resistance to the Diem denominational persecution. Twenty days after the assassination of Diem, the first Catholic president of South Vietnam, the first Catholic president of the U.S., John F. Kennedy, was himself assassinated in Dallas, Texas."