Read two of the sequels, and wow, they are hilarious in their masturbatory hatred of the evil liberal gubmint.
The second book follows up on the government taking away guns with letting Mexico take back a sizable portion of the US, calling it Aztlan, essentially a reverse Reconquista. The US government is depicted as being run by spineless cucks (often literally for the latter), homosexuals are depicted as predatory deviants (though the fact one couple tries to force their son to do a prototype of trooning out is oddly foreshadowing of IRL events), and the plot ends with two assholes, one of which is hopped up on drugs and fucks the other to death, which is depicted heroically (granted, one of said assholes did rape the heroine of the book prior).
The third is really fucked up, as it depicts a grotesque parody of Barack Obama trying to whore out the country to foreign mercenaries (a plot point that just drops off the plot itself for some reason after a certain point) and is revealed to be a mustache twirling commie trying to further fuck up an already fucked up country.