Villains don't think they're evil.  Villains don't believe they're the bad guy.  Villains believe in what they're doing.  Villains think they're righteous, and that's what makes them dangerous.... There's a trap in wringing your hands together and going 'Mwahaha' - that's not villainy.  The villainy to be afraid of is the villainy you don't see coming.  He's sweet, he's pleasant and polite.  He sneaks up on you.  And you don't know he's a villain until he's got a knife buried in you.  Now that's a villain.