From the perspective of someone who knows how movie sets are organized and run, I personally believe David Halls is the real scumbag in this story.
The assistant director is (typically) the one who’s in charge of the day-to-day. The director is the creative boss (give or take the political reality from show to show where there’s a powerful actor or hands-on producer), but the director is frequently swamped with endless creative decisions, so the assistant director is usually the one with the actual job of running the set, minute by minute.
In this case, it would almost certainly have been Halls who decided it was okay for Gutierrez-Reed (the armorer) not to directly supervise the firearms, and to prep them for himself to retrieve and bring to the actor. This kind of set organization question would likely have been in his purview. If Baldwin as the actor accepted the weapon from Halls, it’s because this was the (COVID-influenced) protocol on that set. In other words, the armorer failed on that specific day by preparing a weapon with a live round, but Halls failed generally by instilling and supervising the sloppy culture that made it possible for that dangerous weapon to be delivered to the actor on the day.
I strongly suspect, but cannot prove, that Halls pled so quickly because he knew that an objective and methodical investigation and analysis into how the set was organized and who was actually responsible would have wound up incriminating him at least as much as the negligent armorer, and because he recognized that law enforcement didn’t understand the movie industry and his role on the set. He saw that the investigators, being human, were starting to sniff after the celebrity, which created an opportunity for him to dodge accountability and run away.
I have come around on a small amount of responsibility attaching to Baldwin; with the misfires and other issues on the set, he could have forced the production’s hand, insisting that safety should be reconsidered and reprioritized. But this would have brought the shoot to a standstill, for days at least, and more importantly, from a perspective of set politics, Halls was in charge of this stuff. It would have been easy for Baldwin to just keep his head down, trust Halls as a professional, and let the machine work. Obviously, in hindsight, this was a fatal error. But it does not mean primary responsibility adheres to Baldwin.
If my suspicions are correct, then the accountability breakdown is 50% Halls, 45% Gutierrez-Reed, and 5% Baldwin. And law enforcement was seriously derelict in their duty by allowing Halls to plead out before they had a clear picture of how a movie set is actually run and who’s really in charge, and thus who is truly responsible for a hot gun to slip through the usual controls.