Oswald's connection to the murder weapon and location

The argument

Lee Harvey Oswald had multiple ties both to the crime scene location and to the murder weapon in Kennedy's assassination, and taken together these constitute concrete evidence that he was the person who killed JFK. The location comes first. Witnesses reported seeing Oswald at the sixth-floor corner window of the Texas School Book Depository holding a rifle. That places him not merely in the building but at the specific window from which the shots were fired, holding the kind of object that fired them, at the time it mattered. His presence in the building was not in itself suspicious — he had begun working there the previous month — but that fact cuts the other way as well: the job gave him lawful access to an upper floor of a building overlooking the route, which is exactly the access the shooting required. The weapon evidence converges on the same conclusion. Officials found bullet casings for a Carcano Model 91/38 infantry rifle, which is the type of gun Oswald owned, and the bullets recovered from Governor Connally and President Kennedy also match his rifle. These are two independent links — the spent casings at the scene and the recovered rounds from the victims — and both lead back to a weapon in his possession rather than merely to a weapon of a common type. The remaining question is capability, and it is answered by his history: Oswald's past training with the marines gave him the skills to shoot a rifle accurately. What the evidence describes, then, is a man with lawful access to a high and inconspicuous firing position, in possession of the weapon type that the physical evidence identifies, with the training to use it, seen at the window with a rifle in his hands.

Premises

Counter-arguments

Lee Harvey Oswald could have been hired by an organization to assassinate John F. Kennedy, such as the CIA or the mafia. Both groups have also been suspected of being behind JFK's assassination and using Oswald as a trained sniper. George de Mohrenschildt befriended Oswald in 1962 and is suspected of being his handler. Specifically, de Mohrenschildt was thought to be working with the CIA in a plot to assassinate Kennedy. Oswald could have possibly been a hitman hired by the government in a larger scheme to kill JFK.

Rejecting the premises

[Rejecting P3] Someone else could have fired the gun.