There are no requirements in Hollywood that actors must know how to handle the real weapons their props represent. Had there been such rules, then Mr. Baldwin would be guilty of violating that training. Mr. Baldwin was assured by two different people that the weapon he was handed was cold, indicating that it was a prop that could not fire a live round. Just because he was lied to does not mean he should bear responsibility for someone else's actions, whether they were a mistake or not. If I were him, I would sue those who prepared the weapon, claiming that they purposely set him up to be charged and convicted of a crime he did not commit.