Well as some suggest LBJ, was behind the coup that got rid of Kennedy.
If you haven't read "The Warren Commission Report" on the JFK Assassination you have missed out on one of the most convoluted and clumsy government attempts at cover ups ever put into print. What is clear is that Democrats ran the assassination inquiry, democrats led the cover up, and democrats, from LBJ on down, profited from JFK's death.
And yet, almost 50 years after the fact, much of the government information and documentation on the assasination is still being withheld or very heavily redacted on release under the Freedom Of Information Act.
A reasonable assumption is that there has to be a reason for anything less than a complete release of all relevant information.
The only thing for certain is that there is a cover up.
We will never know the complete truth -