How could he

*totally not following to see who knows too much*

Look at it from a different perspective; if every conspiracy theory were true, 128 people were shooting at JFK that day.

You guys do know that Lee Harvey Oswald did actually shot JFK right? Like, even most of the conspiracy theories agree Oswald was involved.
And the fatal shot probably was shot by a secret service agent, and it was probably an accident. An accident born of the panic from the first shot.
Lee Harvey Oswald may not have killed JFK, but he was responsible for his death.