A troll's main goal is usually to arouse anger and frustration among the message board's other participants, and will write whatever it takes to achieve this end. One popular trolling strategy is the practice of Winning by Losing. While the victim is trying to put forward solid and convincing facts to prove his position, the troll's only goal is to infuriate its prey. The troll takes (what it knows to be) a badly flawed, wholly illogical argument, and then vigorously defends it while mocking and insulting its prey. The troll looks like a complete fool, but this is all part of the plan. The victim becomes noticeably angry by trying to repeatedly explain the flaws of the troll's argument. Provoking this anger was the troll's one and only goal from the very beginning.
Wikipedia.org
Winning by Losing
Conclusively proven. There appears to be a serious mental defect located somewhere between the keyboard and the chair.