AND
The elephant in the room: LBJ.
The Kennedy brothers were working behind the scenes to get LBJ indicted and remove him from the ticket for the 1964 re-election campaign.
A partial fingerprint found in the snipers nest was matched to a known LBJ henchman - and LBJ was perfectly positioned to enforce the cover-up and push the Warren Commission to find that the patsy, Oswald, acted alone.
LBJ's handlers worked with the mafia (who got JFK elected on a deal with Joe Kennedy, but felt they had been double-crossed by RFK who was the AG, and pushing hard to indict leading members of organized crime) and with the CIA (Allen Dulles was recently fired by JFK) and FBI (Hoover's head was next on the chopping block) to make certain all the resources were in place to allow the event to occur and cover everything up after.