I agree with what you are saying.
On the other hand, let's be honest, if you were going to take a shot at the prez, would a carcano be your first choice? Even in '63, when a lot better was available for almost the same price?
Oswald was a willing participant. Folks forget he shot and killed that cop when he left the bookstore.
I just don't think a man with his limited ability, with a marginal rifle, (carcanos are NOT known sniper quality, no matter what anyone says)could do what everyone says he did.
IMHO.
GRASSY KNOLL SPECIAL