Aight, I might be a bit on the "right wing" on this, but I actually think it serves well to post IP here. Of course, we can argue the pro and cons about this, but meanwhile, I don't see why someone should not be allowed to warn others about the harm which was imposed upon.
If you want to wipe the IPs, discuss first and convince us. I don't see why you should wipe them out without the users' consent. For heaven's sake, it's just an IP.