Why is mr tumnus a bad person?

Mr. Tumnus from "The Chronicles of Narnia" series is not inherently a bad person. He initially has a lapse in his moral judgment when he considers betraying Lucy to the White Witch, but he ultimately repents and helps her, showing that he has a good heart overall. His actions are influenced by the oppressive environment of Narnia under the Witch's rule, highlighting the complex moral dilemmas characters face in the series.