kelmo
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Dread Lord

Why do trolls do it?
I believe that most trolls are sad people, living their lonely lives vicariously through those they see as strong and successful.
Disrupting a stable newsgroup gives the illusion of power, just as for a few, stalking a strong person allows them to think they are strong, too.
For trolls, any response is 'recognition'; they are unable to distinguish between irritation and admiration; their ego grows directly in proportion to the response, regardless of the form or content of that response.
Trolls, rather surprisingly, dispute this, claiming that it's a game or joke; this merely confirms the diagnosis; how sad do you have to be to find such mind-numbingly trivial timewasting to be funny?
Remember that trolls are cowards; they'll usually post just enough to get an argument going, then sit back and count the responses (Yes, that's what they do!).