I'm assuming you have note seen the somehow-leaked 8mm footage of the driver of the car reaching over his left shoulder with his .45 in his left hand and shooting JFK in the face, and Jackie, who was complicit, acting all horrified.
Jackie O had said "Marilyn was going to move into the White House and replace me. I said if that was what he wanted, I would move out." Suuure, Jackie, suuuure ANY whore would meekly allow some other whore to kick her out of the White House.
Jackie was in on it. She had nothing to lose and everything to gain.