But that'd be plenty. When you turn vamp, you apparently lose your soul, where the conscience is located. I'm not sure I understand the question. Well, if they're constitutionally incapable of obeying the law, that's kind of beside the point. It's similar to the animal rights question.
Animals have no conscience, neither do vampires.
Therefore, neither can obey laws or make contracts. Oh, I see. There's no point predicting. And that might differ from vampire to vampire, blood donor to blood donor. No, they could kill themselves.