Psychologically I think it is very easy to resolve any possible contradictions. "My side are the real patriots - their side are false patriots who are actually bootlickers/oppressors/occupiers/traitors/etcetera."
They tend to believe the threat is enough and that they'd never have to act on their threat (rendering it meaningless), or that all of the cops/soldiers will just let them kill the politicians (and killing a politician for a differing political belief is somehow generally okay for these folks).