But we know that is not how things are. There is plenty of evil around us and within us. If we say that evil is not defined for the Transcendental Self, it does not follow that there is no evil at all. Instead, we must look elsewhere for the origin of evil. We find it in the Social Self's conceptualization of transcendental motivation, not in motivation itself.
Zombies are evil for that reason.
That's why they are scary. Mad slasher serial killers are evil too, because they superficially behave like humans but apparently lack the subjectivity that constrains the rest of us from being killers. We cannot establish intersubjective contact with such a person, so we conclude they must not have subjectivity, as we understand it. If they have no subjectivity, they cannot be motivated as we understand it. Their satisfaction cannot be like our satisfaction.