A producer, there were six producers working on the film including Baldwin, whose involvement was essentially just chatting with the other producers about the film (It's normal for big actors to be given producer credits on films without doing many actual production duties).
That's not really true, he wasn't just one of 6 it's literally his company producing the movie, he's the big boss guy not just an actor with a producer credit.
He is an actor not a firearms expert. He probably doesn't even know what NSPs are!
And that is part of the problem, someone handling a fiream ought to be trained to handle it.
Would it be fine if an actor ran someone over because a car they didn't realise a car they'd been revving for a scene was in gear, they don't have a driving licence and they're just an actor not a car expert, the AD who opened the car door for them told them to push the peddle on the left...
I mean that's basically what people are saying with this not-a-gun-expert thing, it doesn't really take any more expertise than checking a car isn't in gear yet people are treating guns as some uber-technical black box that only people with the job title armourer could possibly be able to understand and check.