They'll take your guns with their guns. The government has a monopoly on violence and they want to keep it that way.
Well, that's just it. No, they don't. Indeed, it's codified in the laws, acknowledging people have every right to forcibly repel unjustifiable violence done upon them. Of course, the whole weight of the State comes with the one side. But there's 200M+ citizens, and it'd get damnably difficult (probably impossible) to stop them from forcibly putting down attempted enslavement if they put their minds to that task, pointless though it might end up being on an individual by individual basis.
The citizens just haven't awakened to that realization.