Fine. Pick one then. Who and how? I won't even ask you to explain why they did it.
Allen Dulles at the top. He meets Paulino sierra Martinez in march/April 63, after that meeting Martinez suddenly becomes a wealthy benefactor to anti-Castro groups. Oct 63, Dulles meets with treasury secretary Doug Dillon which may have resulted in Dillon removing secret service protection from dealey plaza.
James Angleton head of counterintelligence who'd monitored Oswald since at least November if 1959 and likely used him for his mole hunt is tasked with orchestrating cover.
Bill Harvey head of ZRRifle (CIA assassination team) is tasked to find the get the shooters. He was seen in Dallas a week prior to 11-22 despite being allegedly on duty at the Rome station at that time.
David Phillips (propagandist, misinformation specialist) and George Joannides (psychological warfare chief from miami) are tasked with sheepdipping oswald as a communist. To that end Joannides manipulates CIA assets the DRE (Cuban student anti-Castro group) into a confrontation with LHO and green lights their calls to radio and tv people where the DRE tags LHO a communist. Phillips handles the misinformation on oswald's mexco trip.phillips also handles post-assassination misinformation and that was discovered by the HSCA.
It's possible David Morales (operations chief at the psychological warfare branch in Miami) was involved but small group. 6-7 total knew about the extent of the plan.
Harvey died in 1978 and instructed his wife prior to that to destroy all of his files which she did.
Angleton was pushed out in 1974 due to his illegal htlingual program monitoring the mail of thousands of citizens. When CIA officers opened his safe they found autopsy pictures of RFK, and files in both JFK and RFK. They destroyed all of it.
The details are coming out slowly, year after year. It may take 2-5 years just to understand what's in these new documents given cryptonynms and other coded jargon etc
One fact from july's release. Dallas mayor earl cabbel who changed the parade route was a CIA asset.