1. We have no way of knowing if someone was "breaking a rule," so there would be nothing we could do anyway.
2. Let me just make it clear that the point is to show that there is a [i]large[/] group of people who care about it. No one who had it in their sig would just then go off and be mean to villagers. I think that people who have "SPCV Members" in their sig wouldn't break the rules. If they didn't believe in the SPCV, then they wouldn't show it in their signature.
ALSO. Don't worry, if you have been mean to villagers in the past, you are still eligible to join if you agree to change your ways.