Oh wait, that was fiction?
The Zapruder film was tampered with; that is
a simple fact which demonstrates that the government
wanted to give the public a different version of events
than what actually happened.
One can go on from there...
(Mrs. Kennedy also believed that others were involved,
including one well-known political figure. And she
was in a position to know more than most.)
You didn't like the fiction version co-written by that other King, Leslie King, Jr.?