Eh... I fail to see how reveling in one's sociopathy = horror or scary.
The 'fear' in the Personal Horror style of game comes from seeing what lengths you'll go to and how far you'll fall when you do. That requires characters who care about what they are losing (or 'emo' I suppose by your definition).
Whether vampires are sociopaths depends on how their mythology is defined. Do they need to kill everytime they feed? Do they create a new vampire every time they eat? Etc, etc.
What you seem to be describing sounds like the Splatterpunk game, something like Nightlife, though even that has a humanity system (though one of the better one's I've seen). Interestingly, it's a percent system so could easily be ported/adjusted to BRP.
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