I can guarantee you for all the posters who claim they can’t make that shot, they will be on the Bang List bragging about their shooting prowess on another thread.
A few year back I stood at that window at the Book Depositor, (actually the window next to it) and any thoughts of "conspiracy" I ever had went away.
I don't claim to be some kind of expert marksman but I have fired a variety of long guns from 22s to 30-06s and even Civil War vintage riffled muskets, and I know damn well I could have hit a target from that range with any of those weapons.
What was ironic was when I was standing at that window looking out I said aloud "I didn't realize how close this was" and some total strange sanding next to me said exactly the same.
IMHO, it was an easy shot.