[Celestia shakes her head, sadly. She pays no overt attention to his display -- it is only that, a demonstration he is trying to unsettle her with.] Words are cheap, Riddler, and actions dear. For a 'bad person', someone who 'embraced the darkness', you extended a hoof in friendship to me swiftly enough when I appeared here. You answered my questions, you told me a little of your world, you gave me help and offered me more if I needed it.

[She regards him evenly, challenging him -- not to deny it, because words are cheap, but to admit it, because everything she said is pure truth. Perhaps she views it more charitably than he intended to present himself, but that did not change what had happened.]

Those are not the actions of somepony who has embraced the darkness.