Was there a great bit of CYA at the FBI after the fact because of their failures to spot and stop the freak? Certainly. It is would be surprising if the CIA wasn't involved in some CYA as well.
But this is not equivalent to conspiracy to kill Kennedy. Nor is it really even news.
@John_Scotus Oh, you're *in* on the cover-up! /snark
I actually just withdrew from the collection the Jim Marrs book which served as the "inspiration" for Oliver Stone's movie. It was falling apart and I had no desire to repair it.
@John_Scotus ...but MLKJr was...
@John_Scotus I remember years ago the stories coming out how J. Edgar hated the Kennedy family and he might have been in on it.
Was Oswald a person of interest to the FBI and perhaps to the CIA prior to the assassination? If he wasn't, he should have been. Indeed, one of the great failures of the US government was that he was not much higher on their radar.