Foreign governments (Cuba and Russia come to mind), the CIA, the MOB, the military....they still exist and if there is evidence suggesting their direct or indirectly involved shit would fly.
WHITE HOUSE DELAYS RELEASE OF JFK ASSASSINATION DOCUMENTS "NECESSARY TO PROTECT AGAINST IDENTIFIABLE HARM TO THE MILITARY DEFENSE, INTELLIGENCE OPERATIONS, LAW ENFORCEMENT, OR THE CONDUCT OF FOREIGN RELATIONS THAT IS OF SUCH GRAVITY THAT IT OUTWEIGHS THE PUBLIC INTEREST IN IMMEDIATE DISCLOSURE,"; BULLSHIT