'I know there was a conspiracy to murder President Kennedy and cover up the crime.' is a statement of personal belief not a statement of knowledge. It is not a fact but a belief.
A belief that it is a fact. What is the difference? It is obvious to the discerning mind that there was a cover-up and so it is not just a theory.
The public must be satisfied that Oswald was the assassin; that he did not have confederates who are still at large; and that evidence was such that he would have been convicted at trial.
Nicholas Katzenbach Asst Attorney General November 25 1963,
the day of the Kennedy funeral. You may have the last word there Mr Turner, but it probably won't mean too much in the long range scope of things. Cheers