JNR - you seem to be taking this a bit too seriously. If people have a differing opinion what harm is there in that? It isn’t going to change what happened.
Having said that, I’ve been to the museum myself. Dealy Plaza is a lot smaller than I thought it would be. Looking out of the 6th floor windows, I can easily see how a military trained rifleman could make that shot. As former police officer I’m half tempted to say I could have made that shot with my service weapon.
History channel had an excellent special a few months back on the whole scenario including Oliver Stones BS. It was excellent and debunked all conspiracy theories.
I have also visited the Sixth Floor Museum, and the first thing that came to mind when I looked out the windows is what an easy shot it would have been. And Oswald had a 4x scope on the rifle as well.