Many of the so-called "trolls" at Slashdot are often mislabeled. A lot of the time they're merely the only people who'll ask difficult questions, or who'll point out flaws with arguments and reasoning that are painful for some to acknowledge, or who'll otherwise engage in some of the most intellectual and thought-provoking discussion. The fact that they're ruffling somebody's feathers is usually a good sign that they're making a valid and truly insightful point.