Even a casual inspection of his comments page will reveal that he posted a lot in threads other than quote threads, that his comments were of reasonably good quality, and that they were frequently upvoted (and occasionally downvoted). I don’t think there could be any system that would have stopped him from mass downvoting people by manipulating what counts for karma, as he was basically a contributing member of comment society.
He did have a lot of good comments, but he also had a lot of very negative comments. Hypothetically a system could look for people with a very wide range of scores and flag them for deeper inspection.
Even a casual inspection of his comments page will reveal that he posted a lot in threads other than quote threads, that his comments were of reasonably good quality, and that they were frequently upvoted (and occasionally downvoted). I don’t think there could be any system that would have stopped him from mass downvoting people by manipulating what counts for karma, as he was basically a contributing member of comment society.
He did have a lot of good comments, but he also had a lot of very negative comments. Hypothetically a system could look for people with a very wide range of scores and flag them for deeper inspection.