I wouldn’t call the people that plotted to kill JFK sincere patriots. Or should I rephrase that, the people that plotted and killed JFK were not patriots.
True, J.E. Hoover and LBJ knew that it was about to happen. Hoover probably knew because he was connected to the mob. He used to go to the race track with Frank Costello. LBJ knew because he had mentioned that all will be good tomorrow to his girlfriend the night before the assassination. Marcello’s territory included Dallas so I am sure there were connections between Marcello and LBJ. I had read somewhere that Marcello was paying LBJ $50k a month when he was in the white house.
Hoover was owned by the mob, they had pictures of Hoover and his boyfriend so he was solidly in the mobs pocket. When I mention the “mob” I specifically mean Carlos Marcello and Santo Trafficante and above them, Frank Costello.
The main reason that the mob did it was because the Kennedy family double crossed the mob. Joseph Kennedy Sr had promised the mob that they would be left alone if they helped get his son, JFK elected president. Once in the white house JFK selects his brother RFK to be attorney general of the US. The mob hated RFK because of how he dragged the mobsters over the coals during the McClellan committee hearings. I think the straw that broke the camel’s back was when RFK had Marcello kidnapped and eventually released him and his lawyer out in a Central American jungle with no food, protection or anything to fend for themselves.