This is sort of my point. Without knowing the particulars, in my head, I imagine Baldwin being handed a "gun" just prior to a scene and told it was clear, or cold, or whatever. Someone then yells "Action" and claps that little doohickey, and Baldwin comes into view, aiming his "gun" off camera. When he pulls the trigger, as he has done in more than one movie, tragedy ensues. If I'm wrong, then I apologize for my ignorance.
In that scenario, if we are to assign percentage to blame, how do we divide the 100%? To me, the guy whose responsibility it was to inform the actor (who most assuredly is not a gun expert) gets the most, then the production company who hired the guy, then the schlub who was informed by the expert that he was firing a "gun" full of only noise and smoke.
(BTW, I put "gun" in quotes mainly because I assume that this is not a full on real gun that you would, for example, give to a cop or a soldier to do their jobs. I can only assume it's not a gun in the full sense of the word, regardless of how lethal it ended up being.)