Baldwin was the producer of the film.
Yes, and I thought of that after I posted that reply. As well as being an actor on the movie set, he was also one of the producers. So I guess that needs consideration as well. If your kid is playing with another kid in your house and they come across a loaded firearm in the house and one kid shoots the other kid, as the homeowner and firearm owner I imagine that you are going to be in trouble. So considering that, I suppose an analogy could be made between Baldwin and the negligent homeowner.
But maybe that comparison is apples to oranges.
Regardless, he was also an actor in the movie. And actors are all the time pointing weapons at each other as part of the various scripts. So if an actor is handed a firearm loaded with live ammunition and someone gets hit, who's to blame? The actor or whoever loaded the firearm with live rounds and handed it off?

