Cui bono? Follow the money. Kennedy was killed by a CIA/Mafia hit team lead by Poppy Bush. See E. Howard Hunt's
deathbed confession. LBJ, Nixon, and Hoover ran the cover up. Kennedy was going to break up both the privately owned, for profit corporation known as the Federal Reserve and the CIA, the private intelligence and para-military organization of the same Federal Reserve.
Globalist Banksters do not subscribe to the left-right paradigm. That's political pablum used to distract the gullible public. They care about power and they'll kill who ever they need to hold on to it.
Kennedy didn't want to break up the banks. He inherited his father's desire to break into the Establishment. JFK succeeded at that and surrounded himself with Establishment types, including big bankers.
If Kennedy were going to break up the Federal Reserve, why'd he make C. Douglas Dillon of Dillon, Read & Co. his Secretary of the Treasury?
And if he hated the CIA, why had he been such an enthusiast for secret operations and unconventional warfare?
The President who loved James Bond novels and the Green Berets didn't have anything against the CIA, though he may have wanted more of his own people in charge.