I watched the whole thing. Awful story, to be sure.
The most relevant piece of information to the whole thing, which they never mentioned once:
North Carolina already has a safe storage law with penalties for allowing minors unsupervised access to an unsecured firearm. When you buy a new gun at a shop, you literally have to sign a piece of paper saying you know about the law.
The documentary makes vague calls for "changes to the law", supposedly to make people store their guns safely away from kids, as if that isn't already the law.
We all know what they really want: "universal safe storage" laws punishing victims of crime (people who have guns stolen from their cars or houses).
Pretty sure that's what they initially did in England, followed by "oh, well, we actually need to give the cops blanket permission to enter your home and check on the safe storage", followed by "actually, we still don't trust you, so now you have to store your handguns at the police station", and then finally "JK, handguns are banned!"