Baldwin was the producer of the movie on top of having done the actual shooting.

There was some union kerfuffle from what I remember, the union armorors were striking or protesting the safety standards on set. This was not the first accidental discharge on the set (there were 3 previous, they were blank. 2 times previous the actor handling the gun was told it was cold even though it had blanks - i.e. was told nothing was loaded but they were in fact loaded with blanks).

There shouldn't be live armmo on a set. I don't know why it was brought on. The scab armorers brought it on. I don't remember their explanation but I remember thinking it was dumb as fuck.

Baldwin bears some responsibility for allowing safety to go so lax as producer. If you were just an actor and someone handed you a live gun, but you had every reason to think it was a prop gun that was not loaded with live ammo, you wouldn't face a murder charge I don't think- cause you'd have reasonably expected the armorer to ensure safety, you would've checked and seen it loaded but reasonably could have thought it was a blank or dummy. But Baldwin is in deeper shit cause he was in charge of armorers as the producer.

Edit: also, apparently the armorer previously had a discharge on a different movie that made Nicholas Cage walk off. I didnt hear the details.