A list of vampires that isn't voluntary would make it seem like you're expecting vampires to cause trouble. Not your intention, but there's a saying about good intentions and the road to hell. Vampires are being watched. If you think they aren't, you should ask Zero what he gets up to at night and why some of us don't really trust this truce you keep bringing up.
[But the mention of this new development makes him raise an eyebrow.]
So this list would only be people who are joining this task force to keep the peace between vampires and hunters? And no one would have to reveal anything?