every unmoderated board will have its troublemaker. Not much we can do about it as things stand, though many of us (including moi) have tried

How true, ASp, and some boards will have a whole clique of ruling troublemakers.

By the way, I think you are far too modest in describing your personal efforts to drive Plutarch away.

You and Of Troy, along with your new alter ego, Churl Pat, have led the Holy Carpal Crusade against Plutarch for months, if not for years, even when all other old-timers lost their appetite for your self-immolating Crusade.