By the most recent estimate of the Southern Poverty Law Center (SPLC), there are just under 300 non-governmental militias active in the United States. Though the specifics of their agendas vary, their shibboleth is what’s often labeled “insurrection theory,” the supposed right of the body politic to take up arms against tyranny, no matter its source. What constitutes tyranny is rather open to interpretation—one group, Posse Comitatus, rejects the validity of both fiat money and driver’s licenses, along with more familiar grievances about income tax and gun control—but, in every case, there is a common antagonist: an overbearing, conspiratorial government…