Just watch the video again. All the evidence has been captured on film. The two women, one in a red dress, one in a black, signals the operation to begin. There was no sniper. Watch. The driver turns and shoots JFK. Jackie, seeing this, attempts to leap out of the back of the car to get away from the man who just shot her husband point blank. A second agent, positioned perfectly, jumps on the back of the car and flashes a weapon at Jackie, who then, terrified, slinks back into the car.

It's all right there, plain for anyone to see. There was no sniper, no grassy knoll, no second shooter. There was only the driver who shot. It's plain as day if you watch the video.

Edit: link to stabilized and slowed video. https://www.youtube.com/watch?v=iU83R7rpXQY