Oh, this is true old school, “people from under the hill” fairies.

What you’ve got here is the difference between an ethical person, a good leader/prophet/pastor, and a theologian/liturgist.

Theology isn’t limited to Christianity. But hey, if you like your villains cartoony, go with the dualism!

This is the classic theological definition of evil. Evil isn’t the anti-good, it’s the absence of good. Good is typically regarded as some kind of selflessness or care for other, so evil is basically selfishness. There’s nuance, but I wanted to support the challenge to dualistic world view.