"We should just give up since it's hopeless anyway"
No. I think you should look to history to understand what happens when a professional military tries to occupy hostile territory. Asymmetric warfare is impossible to extinguish. The Palestinians are holding their own in a tiny city with AKs, tunnels, and homemade explosives. The Taliban now control all of Afghanistan. The Vietnamese pushed the US into the sea. An armed populace is impossible to repress, especially when it's as armed as US citizens are, and when the territory that needs to be held is as massive as the US. There is absolutely no way the US military could indefinitely suppress the US civilian population while still maintaining the production necessary to fuel it's war machine.
Why would liberals want to purge the police? They love cops.
Ok, what gun control measures should we put in place that would stop "children getting slaughtered in schools" while also not giving the government a total monopoly on violence?
THERE ARE NO MASS SHOOTINGS WITHOUT GUNS. Guns, not anything else, are the root cause of gun violence,
We've had guns in this country since the beginning. You used to be able to buy machine guns out of a catalog and have them shipped to your door for 200 bucks. The mass shooting thing is a recent development. Obviously there are other factors at play.
"Gun control" is a bourgeois talking point. Rifles kill less than 400 people a year in the US on average, the Bloombergs and the Bidens and the Betos are only concerned about disarming the working class. Things that would actually address mass shootings (like affordable mental healthcare) are never even discussed, because those solutions actually cost the rich money.
"They picked his bones clean, Jack! That's how it was back then. Hell, even in Scranton, you get off on the wrong exit, you make the wrong right turn and you're gonna end up in some Mennonite forest camp and all of a sudden they're suckin' the marrow right out of your femur! Boilin' the flesh off your skull so they can drink soup out of it! And I'm the guy that put a stop to it! I went right up to them and said now wait a minute you Anabaptist sissies, you...naw, I shouldn't say that. I'm gonna get in trouble if I say that."