Well they always use Oswald's Basic Training shooting score as some justification for him being able to make that shot. Witch is nonsense. Hatchcock tried that shot with that weapon, three times and he couldn't do it. Carlos Hatchcok was the Number one Sniper of the Vietnam war.
Several heard shots from the famous Grassy Knoll area. Many saw suspicious man leaving the area. Zupruder(sp?) and other films show Kennedy's bodies reaction to the shots. I have heard one dude try to explain how somebody could fall forward from being hit in the front... When your head get hit by something moving at approx.1700 mph, the speed of these bullets.. Your head will snap in the opposite direction as per basic science. Each action, opposite reaction.
The autopsy testimony at the hospital. Orderlies involved both claim theres was "government agent" interference of it.
There was recordings of men in Miami plotting. There is enough info about Ruby to consider re investigating his involvement.
The other assassinations of Bobby and Dr King to me, also contribute to the idea of it being more then just lone wacko's in all these murders.
Who did it? No idea. CIA? as likely as anybody. Castro, perhaps. Russians less likely IMO, The mafia, maybe. Business interests, could be also. I know though theres allot of people convinced, JFK was hit by at least two men.