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I wanted to share an article but after read/scanned ~6 of them - I had nothing to share. They weren't any good. I wish blogs were still a thing. Blogs can be excellent on topics like these. Here's the Wikipedia page - Columbine High School massacre.
The government already has a monopoly on violence and it's a joke to pretend otherwise. In the event of an armed revolution, private firearm ownership won't stop them rolling in tanks or bombing you with jets.
"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.