The only valid argument on limiting the scope of banned weapons is their application for hunting and target shooting. Anybody making the argument that the citizenry should have high-capacity autoloaders to preserve democracy and repel the armies of a tyrannical government is seriously deluded. Even a large group of citizens armed with AR-15s, SKSs, etc. would be annihilated in short order by any well equipped military unit, even a small one. What would your chances be against Seal Team Six, even if there were 100 of you? Not even night-vision optics, body armor, and RPGs will give you any chance against Predator drones, attack helicopters and Tomahawks. 'Red Dawn' was feel-good, Reagan-era propaganda, but had little in common with what the reality would be.
In Pennsylvania, where I live, it is illegal to hunt big game with semi-automatics containing more than 5 rounds of ammunition. If you can't take your bear or deer with 5 rounds, you shouldn't be in the woods. Magazine capacities should be restricted accordingly. If you're plinking, it may be a bit annoying to reload more often, but where is there any real interference with your sport?
Military-style autoloaders are unnecessary & expensive. In the 48 years since I started hunting big game in PA, I've never seen a hunter carrying anything like an AR-15, SKS, Thompson, or Uzi. They'd be laughed out of the woods. All the fancy accessories you mounted on the picatinny rails won't impress the buck you're hunting or fill out your jockstrap.