IMO Nixon was a big guy behind this... as well was LBJ, who had a lust for power.
One of the head's of the Warren Commission was... Gerald Ford. And GHW Bush was part of the CIA at the time.
No one will really know what really happened. But Lee Harvey Oswald didn't do it. Whoever believes that is a blind sheep.
Nixon HATED Kennedy. That is who I think initiated it.