sauoq has made a very good point deep in a subthread that's worth repeating close to the top of the thread. I've seen this in my time as an administrator of another forum, as well.
Perlmonks does not require any sort of identity verification to grant an account, other than a valid email address. Which amounts to no verification at all. Thus, any action taken against Anonymonk will only lead to the registration of throw-away accounts.
Experience teaches us that trolls are more determined than stray visitors. Anonymous trolling will be replaced by throw-away-account trolling which is much harder to ignore because, well, all the trolls are using different accounts. Meanwhile, valuable contributions possibly posted by stray visitors will be prevented.
Makeshifts last the longest.