and are therefore unqualified to have an opinion.
It's because so many persons willing to believe what cannot be proven by forensic science (then Junior Senator Arlen Specter single bullet "theory", which most Americans DO NOT believe. Also, evidence cannot demonstrate it)
It can in fact be proven forensically. Kennedy and Connally react at the same time. Frame 224 of the Z-film, Connally's jacket lapel flips forward for an instant (it can only be seen in frame by frame analysis and comparison of adjacent frames). The alignment of the two men in the car was such that a single bullet would be following a line to pass through both of them. The "magic" bullet (which is in fact not magic at all) struck Kennedy in the back and exited his throat, passing through soft tissue; then struck Connally, seated inboard and below Kennedy, entering his side but being deflected along a rib and not entering the chest cavity; it exited under his nipple, and struck his wrist (by now, slowed by its passage through two bodies, travelling at a much slower velocity), fractured his radius and, spent, entered his thigh (a relatively shallow wound). Those massively deformed bullets you see pictures of in the conspiracy books? Were fired through the wrists of cadavers at point blank range, without the deceleration caused by transit of soft tissues. Ever heard of John Lattimer? He conducted a test where he fired a bullet from a similar rifle with identical ammunition, using the actual relative positions of JFK and Connally, and, know what he found? That a single 6.5mm jacketed Carcano bullet is more than capable of causing all the observed "single bullet" wounds...and that the test bullets he recovered were relatively minimally deformed (being very similar to CE399, the "pristine" bullet).
The trajectory not only works, tracing the path the bullet that caused Kennedy's back wound and throat wound (exit obscured by the tracheotomy performed at Parkland), given the relative positions of the two men, there is nowhere else it COULD have gone. (And that trajectory, traced backwards? Goes straight to the sixth-floor book depository window.)