Exactly the armorer is clearly the accountable one cause she's responsible for the presence of real bullets
I worked on sets with gun scenes. There should never have been live rounds on set, true, but it's also on the AD/producer who brought the gun to Baldwin, and Baldwin.
The rules for a gun to be brought to set are:
producer/AD and armorer go to gun set
armorer produces gun, demonstrates that it's empty to AD.
AD supervises as armorer loads it (if it needs blanks or dummy rounds) and verifies each round is what it's supposed to be
AD takes gun directly to set
AD demonstrates to actor that the gun is empty loaded with what it's supposed to be
actor has been trained that you never ever ever point a gun at another human being, and also specifically seperately trained in the specific motions that specific scene calls for and how to perform them safely
There should not have been live rounds there, but clearly none of these things happened, which a multi decade veteran like Baldwin would've known was seriously wrong, and then he finished it by pointing a gun directly at another person and pulling the trigger, which has been absoutely rule #1 NEVER to do since The Crow
Seriously, if you are carrying a prop gun on set and even sweep another person it's an instant safety meeting and usually a good yelling at. Baldwin has done dozens of gun scenes, he knew damn well not to do what he did.