It could be your fault if you hired an incompetent person and knew they were reckless with lack of due care, although criminal liability would be harder to stick, but still possible depending on the state. Which is why cutting corners and hiring an uninsured contractor can bite you in the butt if they or someone else gets injured while they are performing work.
I doubt Baldwin will be charged criminally, even though you could argue he was reckless or did not exercise due caution, which in New Mexico can be enough for involuntary manslaughter and all the stories coming from crewmembers (which may or may not be accurate) make it seem like it was a ********, and Baldwin was the producer in charge. I do believe the people target shooting and leaving bullets in the are more to blame. But questions arise. Did Baldwin know they were target shooting with that gun? Did the armorer? And with that knowledge did he pull the trigger without checking it? It would be up to the prosecutor or grand jury to decide if charges are brought and against who.
I actually like Baldwin as an actor, and have no animosity towards him. Even if he was reckless to the point of legal cupability, I still feel bad for they guy either way. Ultimately, he pulled the trigger which killed a mother with young kids. I don't know how I could handle that, even if you want to call it an "accident".
More than likely Baldwin will be sued in civil court, and the film insurance will settle with the family.