Exactly, but why make it easy for them online to the point where they could easily screw with you offline as well?
Sorry, but I still completely disagree with your position on forcing people to disclose their personal information for all to see when they register with an online community. It's unethical and it's just plain silly.
When it comes to cyberbullies, this is when the moderation team, or GM staff, need to get involved and take care of the issue accordingly. If they're too lazy or incompetent to do so, then it's time to seek greener pastures.