If people were following the protocols that have been effectively in place for the last nearly-thirty years it shouldn't have been possible.
I don't know a ton about production, but even I know enough to say YUP, you are 100% right. I'm honestly wondering if it wasn't an accident. (I'm not blaming Alec Baldwin and saying this was premeditated on his part. Not at all. But he isn't the only person on that set with access to that prop gun.)
In short, the actor and the weapons master are the people who touch it and it's on an active set or is locked up. Actors don't take it to lunch, don't take it to the bathroom, don't lie it down on any not-in-scene surface. If actors go on any sort of break they check it back in with the weapons master. Actors use it in the scene and the weapons master locks it up. Any work a weapons master does on it is in a controlled location.
It is horrifying. I'm sure we will find out what went wrong, but mostly I can't and don't want, to imagine what it would be like to accidentally kill someone.
And then if the gun is actually DRAWN there's a whole speech (and you'll hear it about sixty times) where you're told what the gun is, how it will be used, what it can and cannot do... and then its offered to anyone who wants to see it and shine the flashlight through the blocked barrel personally. This happens repeatedly.
I remember earlier occasions when people were killed on set with prop guns ... even ones with blanks.
John Rogers said on Twitter that any time a gun is in use on his set, he puts it up against his hand and fires it before they do the scene.
It sounds like that was a bad situation before the shooting.
I was watching a show on conspiracies where they reenacted how Brandon Lee died on set to show how it was possible to be killed with a prop gun filled with blanks. It came down to something being left in the barrel of the gun that shouldn't have been there that was dislodged by the blank, but I don't know enough about guns to remember all to details.
Nothing to fool with, that's for sure.
In an unrelated note, :MOM, IT"S OKAY TO TELL ME THAT YOU WANT SOMETHING! I feel bad that we half-assed a milestone birthday(actually sort of hard to avoid since Events are still a bit scary, like "here are some tickets...now with added fear of illness, you know. ) But still, at times like that, fuck that viking stoic bullcrap.
I can kind of see why it was hard to be her bf.