[Zack Nguyen]

The available evidence indicates that JFK and RFK put a stop to the attempts on Castro as soon as it came to their knowledge.

Really? I have read exactly the opposite, that they were desperate to kill Castro and pushed the CIA to do so, hence Operation ZR/Rifle. I read about this in The Dark Side of Camelot.

[justshutupandtakeit]

Preparations for killing Castro began before the Kennedys were in office and were hidden from CIA higher-ups as well as the Kennedy brothers. This is a controversial point but the man in charge of these attempts (Willian Harvey, I believe) said that RFK was furious when told about these actions and ordered in no uncertain terms that it stop. In fact, it continued for another six months or so after it was supposed to end. Allen Dulles' successor was unaware of these actions. Richard Helms told the Senate that he was not told because being new the Director would not understand the alliance with the Mob so he was spared that embarassing knowledge.

Evidence (as well as John Roselli's remarks) indicate that the apparatus put in place to kill Castro was turned against JFK.