If, in fact, those thousand people are dead -- or even some significant fraction of them -- then we are looking at the largest terrorist attack since 9-11. Even the Vegas mass murder only killed 58, though it wounded over 500 more.
The imaginary date suggests December, ie, next month. BATFE is going to do this without legislation, and it will have a significant economic impact (hundreds of millions) even ignoring the fact that the law will take probably thousands of people who bought legal products for their firearms and turn them until felons unless they destroy their property for basically no reason, all sparked by a shooting that the government continues to hide details about -- and can't even prove the shooter actually used bump stocks, because they did not examine any of his firearms.
Trump should step in and smack this down hard. But he probably won't, because it's not really his issue.
Maybe the NRA can wake him up... except they are kinda-sorta-agreeing.
They are refusing to call it terrorism, even though the suspect is Afghan and apparently was stabbing people randomly on the street. Armed with a knife and an iron bar, he wounded seven people, and four of them are in critical condition.
This is proof that you'll still have mass murders even if you manage to wave a magic wand and take away guns. There will always be murderous people. They will commit murder even if it's just Cain, Able, and a handy rock.
I think the suit against the guard is probably BS. Even if he screwed up in some fashion, he's not responsible for the attack. The civil rights claims against the responding police officers are more interesting.
Police have no legal duty to protect people. That's well established law. Do they have the legal authority to detain people in a situation like that? Maybe temporarily, but the suit claims 10 to 12 hours. That's stretching it a lot. So is confiscating cell phones (and presumably searching them) absent probable cause.
What seems to happen in these cases is that police completely lose their shit and panic while holding everyone in the area captive until the panic fades.