I realize that this doesn't quite apply to movie sets, where prop guns are used to portray the act of firing a weapon at someone, but....
I am -- as my gun-toting, NRA-loving, second amendment-quoting, 'Molon Labe' bumper sticker-having father likes to call me -- a bleeding-heart liberal. But I grew up in his house and was taught basic gun safety from a very young age.
You treat every weapon as if it's loaded with a live round. Period. If someone hands you a weapon, you check it yourself. It doesn't matter if they say it isn't loaded. It doesn't matter if they're your shooting range supervisor or your shooting instructor. You check it yourself. Period. And then you still treat it as if it's loaded with a live round. You do not point the barrel in the direction of anyone or anything you don't want to drop dead.
Ironically, my father now gets irritated that I check things he hands me because apparently it means I don't trust him, but fuck that. You check. You behave as if you're holding a weapon. Because you are.
Every time I hear something else about "safety measures" on that set, I cringe just a little bit more. I feel bad for Alec Baldwin, but as far as I'm concerned, everyone else with even a modicum of authority on that set or even a semblance of responsibility for the safety of the cast and crew should absolutely have their asses handed to them atop a platter of lawsuits and any criminal charge that might stick.