I'm reminded of the Sopranos or when the US enlisted the help of the Sicilian Mafia during WW2. In RP there is plenty justification available for such an arrangement. In fact, pretty much ANY rp that serves the purpose of teaching those whose ridiculous behaviour only serves to disrupt game-play on the server is to be welcomed.
This is Sparta. This far and no farther. Ils ne passeront pas. We shall fight them on the beaches.