I've suspected a conspiracy since I read parts of the Warren Commission report back in the late 60's when I was about 12 years old. Then, when we were permitted to view the Zapruder Film and saw the direction of JFK's head after the hit I was even more convinced it came from the front.
Then, sometime in the 80's I read about the analysis done by Luis Alvarez and although I still felt the head shot came from the front I couldn't completely rule out the head movement as being the result of the jet effect. Testing of my own with an AR-15 riffle and jugs of water, not a perfect analogue of a human head I know but a good approximation, and seeing that many of the jugs move towards the shooter convinced me the jet effect is real and may explain his head movement.
In 1993 I traveled to Dallas for the 30th anniversary and it was while there that I came to accept that there are way too many conspiracy types out there. I ran into many dozens of guys with cardboard props and displays that were hawking there pet theories and by the time I left I had come to the conclusion that: I will never know the full truth, that the truth is probably out there but buried within a wall of bullshit, that Oswald may have done it all by himself, and to repeat ... I will never know the full truth!
A frame by frame analysis of the Z film indicates that his head moves forward a bit in the frame before you see the head shot and some interpret this to be the momentum transfer from a rear shot which is then overwhelmed by the jet effect that causes his head to move rearwards. Others believe that the head shot is actually two shots that hit within a single frame of film. I just don't know...
Finally, in the aftermath of 911 it's painfully obvious that there are a shit ton of conspiracy nuts. And sadly, if there had been a conspiracy to kill JFK the conspiracy nuts have so utterly confused the facts to the point where it's hard to know up from down let alone who was involved.
But, I've not completely given up on the idea that there was a conspiracy and the fact that young Oswald was in fact in the company of a guy like David Ferrie and his connection with Guy Bannister does in my view suggest that Oswald was very likely involved with some nasty folks and that some of the conspiracy theories on this subject may in fact be true.
http://www.isgp.nl/miscellaneous/de...iter_David_Ferrie_Oswald_Civil_Air_Patrol.jpg
But, sadly, I do not expect to ever know for sure...
Brian