Casual Friday: a madman, or an idiot
“If anyone, no matter who, were given the opportunity of choosing from amongst all the nations in the world the set of beliefs which he thought best, he would inevitably, after careful consideration of their relative merits, choose that of his own country. Everyone without exception believes his own native customs, and the religion he was brought up in, to be the best; and that being so, it is unlikely that anyone but a madman would mock at such things.” –Herodotus.
Original meaning of idiot: a person who did not extend himself to his community and its relationships. . . as, in, going only by the id. .