Some people in every walk of life lack social self-awareness, thrive on everyday contrarianism, and in the worst cases show the traits the dark triad describes. They seem overrepresented in positions of power, in business management and in politics, partly because many of us admire exactly those traits and elevate them. If you are lucky the cost is annoyance; in extreme cases they can make your life miserable or damage a whole organization, so it pays to know how to handle them.
The collective part is harder: societies that idolize these personalities keep promoting them. Recognizing the pattern is the first defense. The counterweight is the light triad that Scott Barry Kaufman and colleagues proposed: humanism, Kantianism, and faith in humanity. Pure light rarely wins an election and pure dark should never win one, so look for leaders with a balance: enough edge to act, enough decency to be trusted.