When political people describe certain groups of people as having cluster B traits, it often comes from people who look at people through the lens of behaviors. So we associate splitting with extreme left or extreme right hysterical protestors.
But the smart ones always know how to hide problematic traits. And if you only look at their political opinions or opinions about the world, you would never know they are splitting. This leaves out a bunch of people who we can only observe through their personal blogs or a very close look to know that they are “discouraged” or “deflated” type of narcissism. Or “quiet” type in borderline. Because they have a problem of looking inward, not a problem of critical thinking.