There is some direct evidence. But the circumstantial evidence is enough to convince a reasonable person that Oswald was on the 6th floor and fired all three shots. The evidence of what he did afterward speaks volumes. And the evidence that he fired a shot at Gen Walker's head constituted similar fact evidence of the most cogent kind.
Circumstantial evidence and Assumptions-based evidence is all there is.
Perhaps that's plenty for you to be certain that he acted alone but for most people, it's obvious that we don't know the whole story.
Ruby was a nightclub owner who carried a gun and liked pistol whipping the odd patron who touched his employees inappropriately. There is innuendo but no hard evidence that he was affiliated with "the mob". Besides, the Mob disliked Bobby Kennedy more than Jack. And Frank Sinatra was a good friend of the President.
From his childhood in Chicago up until 11/22/63, Ruby was associated with the Chicago Mob and later, the Dallas and New Orleans organized crime organizations.
Carlos Marcello, the New Orleans Godfather, hated JFK and vowed to have him killed.
Joseph Campisi of the Civello crime family in Dallas was one of Ruby's first visitors in when he was Jailed after shooting Oswald.
There are always little problems with evidence.
True but it can be argued due to the problems with the forensic evidence, that we can't conclusively say there were no other shooters.
Are you referring the the NAA analysis? I will agree that the comparative bullet lead analysis has been debunked. But that just means that it cannot be shown that the fragments all came from the same bullet. The shells came from the MC but the only bullet that can be positively tied to the MC is CE399.
Yes, the NAA bullet analysis has been debunked.
Also, we don't know for certain that CE399 wasn't planted due to the broken chain of evidence.
I'm inclined to believe it was planted.
True. But Oswald was an impulsive person. How many people do you know who shared his political views actually gave up their citizenship and moved to Russia? How many people who disliked Gen. Walker took a shot at him? How many people took a longish package to work on the morning of Nov 22/63 and had their palm print on a package in the sniper's nest? Oswald was probably depressed and angry at the world because he was working for $1.25 an hour and had to support a wife and two young children. Not everything that such people do is always rational or well thought out.
Oswald did lots of odd things that can be interpreted more than one way.
Individuals often apply their own emotions and biases when interpreting the evidence...