Hidden Natures

Innately evil humanoids are like a vacuum. We abhor them. Not just in a “we dislike evil” manner but because we continually seek to fill them. We give them justifications. They’re not evil, they’re the product of their societies or their god. They might have the potential for nobility and kindness, if those virtues had not been kept down by years of abuse and twisted upbringing.

However this humanizes what is essentially “the enemy”. Evil humanoid races serve a narrative role in the word and game as people you can violently murder without feeling bad about doing so. Suddenly they’re not monsters that lack claws and fangs, but people with hope and feelings who were raised in horrible cultures and are the product of their environs. And killing them is suddenly murder.