When someone takes the time and effort to elaborate an 8-page long argument on why something in particular is not impossible to happen, regardless of how unlikely it may be, that tells me someone is desesperately trying to justify a made-up story.

But if on top of it there's similar reasoning for debunking election cheating or pandemics psycho wars, that definitely smells to paid con job.

Ockham's razor is true most of the time. The simplest explanation is the right one.

There's is no exit wound on the back of the head because the wound at the front is the exit wound and therefore the shot didn't come from the said roof, or the bullet was not shot from a long distance rifle.