I agree with everything that Jack, Yop and Em have said. Talking about difficult, complex and frightening topics doesn't make a person disturbed. He isn't promoting anything, he's illustrating a scenario from different perspectives without judgement.
To be honest, this song scares me. Seriously. The first time I actually listened to it was a couple of days ago (I know, blasphemous) when I was listening to my MP3 player while walking home alone after dark and it really creeped me out.
He hands down did a brilliant job. That's how it's supposed to be, anything less would be unrealistic. He has a great grasp on evoking particular emotions through his music and lyrics.