How many of you believe Lee Harvey Oswald acted alone?

Sorry, as paranoid as some people are about conspiracies, I have to agree with them on this one. I watched on the history channel......they ran a computer simulation where oswald was set up as a sniper, the vehicle speed, the type of bolt action rifle...the angle of shot, he could not fire that fast and accurate at vest one shot, another sniper had to be in the area. Ideally snipers operate in 2's if one fails to make the shot, the other will take out the target. Lastly, it is convenient that anybody who was connected to the shooting is dead.......? makes you wonder?