Roger Stone's book "The Bush Crime Family" goes into detail about Pappy Bush's involvement in both the CIA and arranging the assassination. He isn't the one who pulled the trigger, but the amount of coincidences and the fact that he claims that he cannot recall where he was or what he was doing when JFK was killed is enough for anybody to say, "Oh come on! I wasn't born yesterday." Ethan Hunt was the gunman, IIRC, and admitted it on his death bed. Hunt's son helped Roger Stone write the book on the Bushes. The book reveals a lot about Barry Seal too, so you can see how the Tom Cruise movie white-washes the CIA's involvement in the Contra/drug smuggling scandal.