Some things trouble me..
If there was a conspiracy, why was Jack Ruby allowed to rot in jail all those years, and given a long, slow death, thereby risking a deathbed confession?
If there was no conspiracy, why would a thug like Ruby put himself in a position where he knew he was going to get pinched for nothing more than a gesture to a president's widow, whom he had never met?
On the other hand, there had to be 4 shots to cause all that damage to Connoly and Kennedy. 4 shots makes a second shooter a necessity, thereby proving conspiracy.
The weak point in the Oswald acting alone theory is the magic bullet and the Zapruder film that no one ever anticipated.