He doesn't care.
He's arguing for moral relativism as a way to understand a character whose creator has explicitly stated is unable to be saved, has fragmented his soul into numerous pieces leaving him just a husk of a human if he can even be called such, and is literally incapable of feeling empathy or love.
He turned himself into a monster in his search for power and he can't go back.
That being said, the OP has already established that he doesn't have a firm grasp on the Potterverse, let alone biology or historic fact. This is a person who argued that the Romans killed the leaders of Celtic society because they practised human sacrifice, a falsehood that quite aptly demonstrates a truly ignorant concept of ancient history.