I said before, it was a crime of opportunity. He didn't plot it out well in advance. He probably had it in his mind since he saw the route published in the paper, and didn't decide for certain until the night before when Marina rebuffed his attempt to patch things up.
There may have been hundreds of potential assassins we never found out about because opportunity and circumstance didn't line up. This time it did.
Personally, I've had a president drive right by me, to my surprise. There have also been several occasions where I could easily positioned myself along a president's route.
Naturally, I'm no threat. But there are people out there that are and the same circumstances happen to them.
Thanx