Probably part of 'Draining the swamp' program............building a case against the perpetrators that had JFK killed.
"Douglass concludes that Kennedy was murdered because he turned to peace. He was going to work with Khrushchev to end the Cold War. He refused the CIA US air cover for the Bay of Pigs invasion. He rejected the Joint Chiefs’ Operation Northwoods, a plan to conduct false flag attacks on Americans that would be blamed on Castro to justify regime change. He refused to reappoint General Lyman Lemnitzer as Chairman of the Joint Chiefs. He told US Marine commandant General David Shoup that he was taking the US out of Vietnam. He said after his reelection he was going to “break the CIA into 1,000 pieces.” All of this threatened the power and profit of the military/security complex and convinced military/security elements that he was soft on communism and a threat to US national security."
https://www.lewrockwell.com/2017/10/paul-craig-roberts/the-kennedy-assassination-2/