The Cuban plan was called Operation Northwoods and is well documented and factually proven, the US government admitted it, the same way they have admitted fabricating an attack on the USS Maddox as the necessary igniter for war with Vietnam. Neither are matters of opinion, but historical fact.
The controversy around advance knowlege of a Japanese attack plan prior to Pearl Harbour is far more serious than the 9/11 conspiracies. It is a lot more damning as even a former US rear admiral wrote a book claiming the Eisenhower/Roosevelt administration knew in advance.
Of course we also have the lesson of Daniel Elsberg and the Pentagon Papers, proving that the American government consistently lied to it's people about what was going on in Vietnam.
The idea that American intelligence agencies knew that something was coming up and decided not to take the most drastic measures to prevent it is not exactly unlikely, based on previous American governments.
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