As a data point - I do not and never have owned a gun. I have been to a range and fired one with friends.
The responsibility for gun safety overall on a movie set should fall to the armorer. However, if someone puts a tool in your hand you should be told the basics of handling it safely, even if it is as simple as “don’t run with scissors” or “if you hand a knife to someone you hold it so you offer them the handle to grasp”. It is then your responsibility to follow those instructions and not run with scissors or hand a knife to someone blade first. Likewise, someone handling a gun as a prop should be given instructions as to how to properly handle the prop while using it as a prop. That doesn’t mean they have to be any sort of expert, just that they follow the instructions given to them by the person in charge of safety.
That’s not relying on an “amateur’s knowledge”, it’s everyone following the instructions of the person responsible for safety.
Now, if someone ignores their instruction and role and proceeds to run with scissors or hand a knife to someone blade first and someone gets hurt then I’d argue the person mishandling the object, contrary to instructions, bears some responsibility for not heeding the instructions of the actual expert.
When it comes to guns it is the responsibility of the actor to handle the prop as instructed. If the armorer screws up and a live round that shouldn’t be anywhere near the set gets onto the set, much less into a gun capable of firing it, then the armorer, IMO, bears ultimate and the greatest responsibility for anything negative that occurs.
So… did Mr. Baldwin mishandle the prop handed to him? Did he follow the safety instructions he had been given? I think that’s the crux of his case. But hey, I’m not a lawyer nor am I on that jury. My opinion is worth spit.
Well… having discussed this with some gun owners in real life I’m not so sure of that assertion. A number of them have stated that while they feel competent to own and use guns for their own purposes (two of them, for example, are deer hunters and one of them has been a hunter for more than 50 years) they don’t know the particulars of using them in the context of a motion picture production, haven’t used blanks and don’t know much about them, and so on. Some gun owners have their gun(s) for very specific and narrow purposes and acknowledge that outside those narrow purposes they aren’t experts (I also have known several gun owners who, when their reason for owning a gun ended/went away/whatever sold their guns because they didn’t want to have to bother with the security and other concerns involved with owning one.)
But yes, there are nutjob “ammosexuals” out there who are, pardon the term, loose cannons with more guns than sense. It’s a definite problem. Which, while I obviously have some support for the 2nd amendment I also support framing it as a limited right rather than an unlimited on. For which position I am often condemned by both sides.