Again "I didn't know it was loaded" is not an acceptable excuse in a court of law when someone dies. And as a producer, Baldwin was also a boss of the movie. He also shares a responsibility to make sure competent people are hired to do dangerous jobs. He also broke your industry protocol when he pointed that gun directly at other people when he pulled the trigger during a break in filming. He very much appears to culpable for a good amount of the negligence that got someone killed.
He needs to be charged and go through the legal process like anyone else would be, (hence the involuntary homicide charge). He should get no pass because he's a rich and famous actor. If the court says it wasn't or was his fault, then fine. The evidence was heard and the court rendered a legal decision and it's done.