Hypothesis: Refuse to accept any individual or group as a political villain unless they routinely issue very large campaign checks. Under this, we get
possible villains: the NEA, CALPERS, Goldman Sachs, the members of our national insurance cartel, Mark Zuckerberg, the NRA.
not possible villains: Radical Islam, immigrants, American overconsumption, Leftists on campus, SUV’s, and (as a rule) all individual politicians.
The rule will miss a few obvious villains (corrupt city councils, ideological judges) but the spirit of the rule is to only vilify beings that have direct control (even if not total control) over the levers of power.