JFK flipped on the mob (who claims they killed him, but they are known for saying stuff) he wanted to shut down the CIA and possibly the FBI, He was clearing out the nut parade in the joint cheifs who were seriously suggesting to a WWII war hero that maybe indiscriminately bombing the US as a pretext to war was a great idea! He was also making in roads with Russia behind the scenes, and he had signed the withdraw papers to end The Vietnam War by the time he was assassinate. I don’t know who killed him, but I can tell you it was a busy week for the large amount of people that would greatly benifit from his sudden demise.