Not really. You have that illusion because of dominance of Abrahamic religions and Rousseau-esque humanist secular philosophies in our World. In fantasy world nothing prevents people from openly living their life adhering to variety of ideologies - Nietzchean, Ayn Rand-ist, Pagan Bhaalist etc. Imagine if our world would be stil Abrahamic, but gnostic, and gnostics believe that God is evil. Would most of people try to convince everyone that they're evil even if they're not, in a gnostic world? After all, putting moralistic things aside, for most people evil=dangerous, so to be openly dangerous to others requires much bravery.