Posner’s book is very outdated having been written 25 years ago.
Many files and new information has been released since then. Reinterviewed witnesses- older retired agents and provided clues.
Cryptographers have unravelled existing released documents.
Coincidences in politics and murder investigations are rare.
http://www.freerepublic.com/focus/f-news/3599037/posts?page=3#3
What is your conspiracy theory? What is your proof?
Posner has updated his book in various editions.
There were many small disjointed cover-ups surrounding the assassination, the SS, the CIA, the FBI, Dallas police, Texas Rangers, etc. each scrambled to not be embarassed by not being vigilant enough when they should have been. It’s not any more than that.
The thing about conspiracy obsession is that if experts like Posner and Bugliosi debunk a conspiracy, somehow a new deeper conspiracy is invented to explain why they are wrong. It never ends.
Extraordinary claims require extraordinary PROOF and there is none here.