I heard an ad and it got me thinking and fuming. It went something like "a biker gang runs this town..." and they're all tough looking big hulking guys....
If I saw my town go down the drain like that I'd not sit meekly at home, I'd start a campaign to wipe them out either all at once or one at a time. This is AMERICA, dammit, we don't just let mafias, thugs, gangs, or biker dudes take over and tell us what to do because they THINK they're badass. Looking tough and acting mean is one thing. But they gotta sleep and they gotta party.
I don't think criminals realize how much they depend on the rules of law and order to survive. If people didn't have to fear retribution and life destroying prosecution, quite a few criminals would be annihilated pretty quickly. So that's something to consider in the end of world scenarios of 'anarchy'. If anarchists truly got their wish of removing law and order from a town or county, I don't think they'd live long to enjoy it.