User blog comment:Dr. Feelgood/Movement to Block all un-registered contributors/@comment-1260687-20100219185713

Exactly! All they have to do is wait for the block to expire and then they start their shit again. Kill them in their infancy. Start first-offense IP-banning - sure, there're ways around an IP ban, but the average user doesn't sit around and renew IP just so he can get back to vandalizing CoDWiki, and most proxy sites are blocked by default on the Wikis; that would cut a lot of your problems.