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I think part of the blame lies with the current moderation scheme. I've felt for a while that the instant gratification of seeing a post's score drop after being modded down is an incentive to abuse the system. I think if they were to change it so that, say, five downvotes for the same reason (troll or spam) are required to cause the score to decrement by one point, it would eliminate a lot of insightful posts being hidden by fanboy modding. The system should still hide the downvoted comment from the voter, since if you're downvoting them you obviously don't want to see the comment anymore.