A short history of lone nuts shooting US presidents.

[nyquil_man]

42. That's possible, I suppose.

However, you've now got over a dozen conspirators on Kennedy's route, any one of whom could be caught and implicated in the plot.

There are now at least three weapons (one per site), which have to be disposed of without being seen or discovered.

Then there's the issue of what the conspirators would have done had they failed to kill Kennedy at the third site. After all, at least three shots were fired in Dealey Plaza and only one of them was necessarily fatal. I'm not sure that qualifies as the work of a professional team.

Finally, there is the question of whether or not any witnesses reported shots being fired at the other sites.