J Edgar conspired with the CIA to cover up the Kennedy assassination. That was pretty bad. The Branch Davidian massacre was in response to Clinton wanting the siege off the evening news cycle. The FBI burned the village to save it.
I think it’s probable the CIA/Deep State killed JFK either as revenge for Bay of Pigs, his screwing an East German spy in the White House, or his peace overtures to the USSR (American University speech).
But we will never have as much direct evidence as we do in the revelation that the “author” of the Watergate story was the FBI Deputy Director.