Okay, I will play what IF:
Take away Baldwin from the whole incident and replace yourself. You are an ACTOR on a movie set. You are called to shoot a scene. The armorer hands you a pistol. You would NEVER, EVER, think that there was real ammunition loaded in the weapon. The director calls action and you point the gun and pull the trigger. The young woman next to the camera drops.
What are YOU as an actor guilty of ?
You didn’t load the gun. The armorer did.
Now, as producer of the movie. Yes, he is liable. Not as an actor.
Negligent manslaughter.
Actor’s Equity SAFETY TIPS FOR USE OF FIREARMS
Treat all guns as if they are loaded and deadly.
The property master or armorer should carefully train you in the safe use of any firearm you must handle.
Do not let others handle the gun for any reason.
Never point a firearm at anyone including yourself. Always cheat the shot by aiming to the right or left of the target character. If asked to point and shoot directly at a living target, consult with the property master or armorer for the prescribed safety procedures.
If you are the intended target of a gunshot, make sure that the person firing at you has followed all these safety procedures.
If you are required to wear exploding blood squibs, make sure there is a bulletproof vest or other solid protection between you and the blast packet.
Use protective shields for all off stage cast within close proximity to any shots fired.
Appropriate ear protection should be offered to the cast members and stage managers.
Check the firearm every time you take possession of it. Before each use, make sure the gun has been test-fired off stage and then ask to test fire it yourself. Watch the prop master check the cylinders and barrel to be sure no foreign object or dummy bullet has become lodged inside.