> Guns as they are allowed now don't allow you to protect yourself from tyranny. Look at the Branch Davidians in Waco, Texas. Whether or not you believe they had illegal guns, they had guns, and they died. Guns lose to tanks every time. When the second amendment was drafted, guns made sense as a way to defend your rights from the government, but in the modern day, it's been probably half a century since civilians lost the arms race. Civilian gun ownership has lost its relevance as a means of defending our rights in the face of increasingly militarized law enforcement.
The thing about firearms is they equalize power. You are almost certainly bigger and stronger than me, you could beat me up in a fight, if I had a knife you could probably take it from me. When I have a gun your power advantage is greatly diminished and your size becomes a detriment. If we're both armed with firearms the disparity in power is much closer than otherwise. If we played out a fight 10,000 times we'd expect the odds to be 50/50 on either side.
The same is true among groups of people: a pair of cops with a gun can control a dozen prisoners working in a chain gang until just one of those convicts has control over a gun. You only need to look at how expensive it is to clear a madman who's held up in their home or for soldiers to clear streets in the middle-east even when most people living there aren't armed (as they're just regular people caught in a conflict zone). Armed individuals mean it's no longer possible for 1 or 2 people with guns to overpower them, you need to outnumber 3, 5, 10 to one to tilt the odds in your favor again.
Look at how effective—or ineffective—powerful western armies were fighting comparatively poorly armed Afghan and Iraqi rebels. For the most part, these were people with relatively little training and practice, small arms, and loose organization and yet they've managed styme the west's greatest powers for nearly 2 decades. They're better armed than your typical dooms-day prepper, but not by much (and those same doomsday people argue they should be able to horde mortars and RPGs if they want to). If we took the most extreme 'weapons-rights' view I think it is reasonable to think a few million angry Americans could oppose a president like Trump ordering the US military to enforce some sort of tyranny. We've seen that kind of thing have great effect in recent history and all the way back to the first and second world wars where armed citizens were able to take bake their cities (Warsaw) and mobilize into effective resistance movements.
That's where the value of an armed population is found. The government can kick in my door with a half dozen thugs and take everything from me. What they can't do is take everything from a town where half the homes have people prepared to resist. An armed population makes it impossible for a government to effectively oppress the people. Can you imagine the Khmer Rouge making much progress in Texas or Arizona? That's the way a firearms owning population protects against tyranny. The government can get away with "picking on" small groups: klansmen, draft-dodgers, homosexuals, men's-rights activists, but it is much more difficult to impose a more totalitarian rule without popular support.
That's the system I think most people generally support: the government has a "right" to use violence against its enemies provided that use is targeted and narrow. It doesn't have a "right" to broadly disregard the will of the people or to try and enforce rules most people won't somewhat-willingly comply with.
---
Some people don't think that's okay: they see the cost of policing in America, where police (rightly?) assume everyone is armed and angry and the police are quick to violence and say "there is nothing worth this!" There are people who will point at the rates of violent crime and say "even if a gun ban won't help, it certainly can't hurt." and they'll hear stories of children killing themselves or their parents 'accidentally' and say "even so-called responsible gun owners can't be trusted not to put themselves and others in danger through negligence."
I understand those positions, I'm even sympathetic to them. At the same time, I don't think it's too much to ask that those of us who think that maybe the American relationship with firearms could use some changes at least try to consider the arguments, rather than trotting out some "lone man with AR-15 destroys US Navy thereby defending freedom of everyone from Trump's goon army" fantasy to poke fun at.