In this case it's more of a modification of rule 12b in gratuitously posting pedophilia threads. Theoretically, I can post a thread about pedophiles in the news, in history, legislation, etc to their hearts content. This does come close to the definition of porn as "I know it when I see it", but common sense should prevail too.
If it's gratuitous, ask them to knock it off. If it's obvious what they are doing despite warnings then treat them like Katzgar or the Polish Retard.
In Legion's case, rule 14 applies to him just as it did to Spaz and all of us.
14. The treatment of Incendiary Troll accounts.
No new rules. Maybe clarification of the old ones.