You can’t prove that Oswald did it anymore than someone can prove that the mafia, or the Cubans or the CIA, or whoever did it. Besides, stating that the Warren Commission findings are flawed (which they are) doesn’t require someone to prove the alternative theory.
I have no idea what happened to Emilia Earheart (sp??). However, while I can say without question that I (or you) didn’t kill her, but I can’t prove that.
According to your intellectually lazy logic that you use to dismiss the physical mechanics of Oswald's shooting ability, you're not even sure that Amelia Earhart's plane ever again made contact with the surface of the Earth, much less crashed somewhere.
Actually, I did prove he did it or at least the testimony of the witnesses and the evidence did.
The problem the conspiracy theorists have is they can’t prove someone other than Oswald did it.
I’ll give an example. Since some people can’t understand how the pyramids were built, they don’t believe people built the pyramids. Enter the space aliens.
So Oswald killed Kennedy. But there are those who disbelieve it due to an old saying, “The peasant can’t kill the King”. It shakes their sensibilities.
The next explanation is the “hate group”. They hate someone so much, they try to pin the murder on them, whether it’s LBJ or “Bush did it”.
There’s also another small group. That’s the group who think they are smarter than the balistics experts, the pathologists and the doctors/coroner. Since the experts have one view, that group which has an authority problem will take another opposite view just to be “smarter” than the experts.
I almost forgot the largest group. They saw a movie. It must be true.