Many horror movie monsters and slashers are actually acting as violent vigilantes, and the storylines firmly establish the victims as bad people who bring their fate upon themselves.
These movies also typically include a character who is pure and innocent, one who is terrorized by the villain but survives the encounter and sometimes ends up taking out the killer in the end.
They draw the power to vanquish evil from their innocence, but sometimes the innocent must commit a sin to draw out their deadly prey... (NSFW)
Night of the Slasher from Shant Hamassian on Vimeo.
Night Of The Slasher was written and directed by Shant Hamassian, and if you enjoyed the concept you should check out the Image comic series Hack/Slash, which is about a girl who hunts down slashers.
-Via GeekTyrant