“....all these agencies were involved that everyone involved would have kept their mouths shut?”
Many did not keep their mouths shut.
Google E Howard Hunt deathbed confession to son. There is a video and audio and it is widely accepted.
The preponderance of evidence is it was a widespread conspiracy involving many interested power verticals.
Just to prime the pump....E Howard in his own voice...
https://www.youtube.com/watch?v=ZYSE_Zb4sxs
E. Howard Hunt?
Wasn’t he involved in the Watergate affair?
Sorry friend but I used to believe in the conspiracy thing but after all is said and done no one proved any conspiracy.
“Once you’ve eliminated the impossible, what ever remains, how ever improbable, must be the truth’’.