The last time I shot a rifle was during Navy boot camp, 55 years ago. I don't even remember how to load the thing. So, if someone gave me a weapon, and told me there were blanks in it, I wouldn't be able to judge for myself. How would I know they were blanks?
But I wonder if I hire an electrician to rewire my home, and he screws up and burns the place down, am I responsible for his errors, because I didn't "supervise" him? Wouldn't it be the same as Baldwin hiring a known fire arms consultant, with movie experience? Baldwin may civilly be liable, but criminally liable???? I dunno.