Recommended reading … now more than 50 years old … still applies in this moment
“American politics has often been an arena for angry minds. In recent years we have seen angry minds at work mainly among extreme right-wingers, who have now demonstrated in the Goldwater movement how much political leverage can be got out of the animosities and passions of a small minority. But behind this I believe there is a style of mind that is far from new and that is not necessarily right-wing. I call it the paranoid style simply because no other word adequately evokes the sense of heated exaggeration, suspiciousness, and conspiratorial fantasy that I have in mind.
… Of course this term is pejorative, and it is meant to be; the paranoid style has a greater affinity for bad causes than good. But nothing really prevents a sound program or demand from being advocated in the paranoid style. Style has more to do with the way in which ideas are believed than with the truth or falsity of their content. I am interested here in getting at our political psychology through our political rhetoric. The paranoid style is an old and recurrent phenomenon in our public life which has been frequently linked with movements of suspicious discontent.”