Does the word "pure" is used to emphasize something? Because I don't think the word "pure" and "evil" seems quite contradict.
Native speaker’s answer
Rebecca
The word "pure" is used to emphasize the word "evil." "Pure" in this scenario means "complete," "only," or "utter." When Andy says "pure evil," he states that he thinks WikiBear is completely or utterly evil. "Pure" can be used with other adjectives as well, not just "evil." Ex: That is purely coincidental. Ex: Many shows are made for purely entertainment purposes.