So why have the most resent presidents not released all the JFK papers? If it were revealed today that the CIA was responsible for the assassination of President John F. Kennedy:
Resignations: There would be calls for the resignation of the President and the Director of the CIA. The President would be under pressure to step down because he would be seen as responsible for the actions of his agency. The Director of the CIA would also be under pressure to step down because he would be seen as responsible for the assassination.
That's why, No president going to lose their job that way.