I wonder if it's democracy that's the problem. Representation, appeal to the lowest common denominator. Give people a choice and they'll choose a tyrant, even one they distrust, so long as he keeps the food and entertainment coming. Authority is devalued, yet power still consolidates into the hands of a few. Chosen not by "divine right," which tends to instill a certain loyalty to the rules of the God that establishes the system; chosen not because they were trained for it and merit the position; but because they believe the "will of the people" is for them to model, enact, and satisfy the public's baser urges. Good and evil become lost when the questions are no longer "right" or "wrong," but "fun" or "not." And so, subsumed by our base desires, the time comes that we become as the Great Old Ones, free and wild and amoral, reveling in sound and fury, in death and destruction.
There's another figure, after all, who came to people as a man in black, bearing secret lore. A figure who came to Arkham himself, in the bad old days, and had been abroad in New England before the American Revolution as well, teaching the ways of darkness, power, and the Great Old Ones to the witch cults that thrived in both the 17th Century and the early 1900s.
I'm sure you know his name.