I'll bet it's as sad as this one.
Trolls can be menacing, terrifying, even more so when they become stalkers.
Disrupting a stable newsgroup gives the illusion of power, stalking a strong person allows them to think they are strong, too. In one sense, having a troll is more of a compliment than something to fear. To illustrate this, I am publishing a log of MY troll, Spiro. All this is based on public posting by Spiro. Sometimes it wanders off, but always returns - usually after a month or two.