Commitment to an idea is not too far removed from being committed to a mental institution. The zealot and the madman have much in common. Extremes in behavior occur with both, however one is conscious of their actions the other usually not. Who is more dangerous to society? The zealot often kills others to prove their point where the madman is usually only a danger to them-self. Let’s lock up all the wide-eyed ideological fanatics and let the crazy people run free!
What do you get when you combine the worst traits of both zealot and madman?
A politician. Someone delusional enough to believe their way is best for everyone.