If the proportion of negative comments is growing and if this is a symptom of karma lust, it's a pretty interesting event. The assertion being that as karma wealth grew, the system has became more volatile. There are some complaints about swarming in up-votes, but this thread deals with increasing down-votes. The question now becomes will a higher frequency of down-votes bring about smarter comments so as to avoid down-votes, or will the system become unhinged?
..I wonder if any systems act similarly? ;)