Some of what people call "trolling" (on the net in general, not LW specifically) amounts to asymmetrical resource starvation attacks against humans. This sort of troll can be modeled as thinking, "What's the least work I can do, that will elicit the costliest response from the mods / regulars / other suckers?"

If the process for dealing with alleged trolls is itself costly for mods or regulars, then it becomes a vulnerability.