If the person has some stronger belief (e.g. people are important, and hurting them unnecessarily is bad) that can override “never allow green-skinned people in

If the person has some stronger belief (e.g. people are important, and hurting them unnecessarily is bad) that can override “never allow green-skinned people in your neighbourhood”, they're redeemable. If they don't, they're evil. (Evil people can be rational, too.)