I never could get my mind around the idea of the conspiracy thing with the Kennedy assassination. The problem I have is with Oswald, the man dedicated his life to being the kind of nutty freak with delusions of grandeur that could and would attempt to pull off a stunt like that. Everything about him from his defection and repatriation and attempt to duplicate the process with Cuba, his fields of interest, his failed attempt to assimilate with a Russian bride, et al add up to a person that would attempt to and had the training to make a bold move like that but was way too much of a loose cannon to figure into any coordinated coup attempt. The man made the trip, fired the rifle, killed a police officer when found in the theatre,... there simply couldn't have been a coup without his involvement and who could participate in a coup knowing that you are relying on that wing nut to carry out his role with all the evidence pointing at him? When you hear the magic bullet stuff it was nonsense (the bullet was not veering in multiple directions, the bodies were contorting from the attack). The skull shot looked like an exit wound but who would be partnered with Oswald? The Ruby thing was strange but people react strange in strange times.
I just think people are uncomfortable with how unavoidably vulnerable we are to lunatics willing to sacrifice everything to create havoc, the same with 9/11. If someone wants to do something bad enough that they are willing to die to do it there is very little we can do to stop them and attempts at deterrents most likely would always be a worse burden on society than the actual threat. Lee Harvey Oswald was simply Jared Loughner or Nidal Hasan with greater ambition.