And there's the added layer of Baldwin being the producer, and so he's the guy who hired the crappy armorer in the first place.
But ultimately none of that matters now. The reason this case was dismissed is not because of any of those questions of who's responsible for what on the set, it was dismissed because the police and the prosecutors withheld evidence from the defense.
You do not withhold evidence from the defense in a criminal trial, that's a huge no-no.