(Stuff about Militia being useless)
We'll have to disagree I tend to think that a bunch of untrained people can effectively cripple a modern government. It just takes a little understanding on how vunerable organization really is.
Issue one:
How massively distributed the US government is, and that it has protocols in place for dealing with the death of politicians. Who/what are you going to take out that would lead to a collapse? Politicians are all replaceable, and killing one just makes him a martyr. Buildings? There may be symbolic value to some of them, but nothing that would make a palpable difference could be seized by a bunch of ill-equipped hicks.
How's this little fantasy going to play out? You storm a building... now, what's a valid target to assert control over a region? A courthouse? A police station? Or maybe you'll just drive around in pickup trucks shooting at cops, and telling the news you've seized the city? Say you actually pull that off, what do you think will happen? The nation will say "by golly their copkilling spree has really taught those fascist pigs not to take my guns!"? Hell, since a lot of people have guns, you'd probably have to deal with vigilantes too, since people wouldn't take too kindly to a bunch of assholes driving around shooting up anyone who looked at them wrong. And then there's the governmental response, which brings me to...
Issue two:
The government has more guns than you, and most of them are bigger than yours! You think your merry band of drunken louts could deal with so much as a swat team? And if you did, you think they'd give up? No, that would just make them mad, and they'd roll in some armored vehicles and shoot you to pieces, assuming you all didn't just shit yourselves and surrender at this point. You might, by some unfathomable stroke of luck, take a few down with you, but you really think you'd have the resources and numbers to deal with them? Which brings me to...
Issue three:
You would not, under any conceivable circumstances, have the numbers either to topple the government, or even to be considered more than a small band of batshit insane extremists. Conditions
can't get bad enough to garner popular support for violent (and suicidal) action. Politicians may be corrupt to the bone, but they still pander to their constituents, and when they don't, they have quite good PR to distract and deceive their constituents. Meaning people won't be so dissatisfied that throw their lives away, most likely for nothing, at least in numbers capable of actually accomplishing anything (and again, who's to say these dissenters would even be unified? in all likelihood they're more likely to turn on each other before they go after the much harder target of the government), if nothing else because...
Issue four:
So, you've somehow managed to topple the vast power structure that enforces peace and rights between individuals, congratulations! You now have a fragmented populace, a very large percentage of which probably doesn't agree with what you've done. There are two possibilities at this point:
a) Your paramilitary organization is powerful enough to exert influence over the remnants of old power structures (presumably, local institutions would be left intact, unless you're following a just-in-it-to-see-the-world-burn mentality and destroy everything). You've enacted a violent coup, and people for some reason are listening to you, instead of lynching you in the streets and reseating the government you just toppled. Congratulations, you're now a military dictator! Which is somehow better than an elected government...
b) You destroyed the power structures, somehow so thoroughly as to leave the nation too fragmented to just undo the destruction, but oops! You got lynched in the streets by your detractors! There's no organization powerful enough to replace the old government, so you end up with petty warlords and organized criminals, assuming another nation doesn't just swoop in and take the territory (which, actually, would be greatly preferable to pseudo-anarchic warlordism).
Like I said, there are valid reasons for owning a gun, namely hunting, self defense (mostly through deterrence), and, to a much lesser degree collecting. Thinking it will somehow protect you against, or by some even-more-insane stretch meaningfully
injure an ostensibly malign entity that's infinitely more powerful than you are? That's completely insane. You may as well insist that a spork will protect you from aliens.