I watched all of them. (I did skip over what I think were introductory remarks by John Schneider.) So I see there is a protocol (i.e., a set of habits) for handling firearms on set. At the very least, the armorer who handed the gun to the assistant director should have verified the gun was empty, and then the AD should also have done the same. Three of the videos made it sound as though the AD should have proved to Baldwin that the gun was empty, before handing it to him. The last video was ambiguous on that point. Either way, Baldwin is in trouble because he was a producer, and his set deviated from standard practices.