The ideas of good and evil are abstract, we learn this with Darkstalker. He thought what he was doing was good/right for his tribe and enslaving everyone else was the natural order. What one person defines as good/necessary, another could see it as evil/unnecessary. Thus the deletion of magic, I think explicitly animus dragon magic. We haven’t seen if humans are capable of magic yet unless that’s noted in that one book that follows the humans who killed oasis. (I’m assuming that’s what that book is, I haven’t read it)