Because you like Hogarth Hughes in The Iron Giant

Hell hath no fury like an evil fairy scorned. See them in Maleficent.

A daring conman, Flynn Rider is so charismatic that you might not mind when he steals from you. See them in Tangled.

When the Sorting Hat touched Draco Malfoy's head, it placed him in Slytherin, a house that has turned out more dark wizards than any other. See them in Harry Potter Series.