How Oedipus Address my Question

This question is particularly difficult to apply to Oedipus, I think, because Oedipus is not really a story about good and evil.  Jocasta may be interpreted as evil for leaving her son in the wilderness, but then again she only did it because a oracle told her to.  Oedipus the King may be evil because he slept with his own mother, but at the time he didn't know it was her.  Maybe.  I don't think that Oedipus is a good example of whether humankind is inherently good or evil, because it doesn't contain a real hero or a real villain.