If you handle a firearm, it is your responsibility to know whether that firearm is loaded, simple as that. Hollywood shouldn't get a pass just because Hollywood has been irresponsibly handling firearms for its entire existence. The responsibility lies both on the armorer and Baldwin, they both failed in this moment.
If you handle a prop on a movie set, it's not your responsibility to know that this time it's not a prop but real loaded gun this time. It's inconceivable to me how it's even possible that a gun even there, but I guess I am not American enough to understand that
If there is a possibility that there are real guns on set or they cannot distinguish, then they need to learn how to distinguish or not agree to point one at another human.