On individual comments and posts, the karma system is valuable for telling you if you're being stupid or not, and I appreciate it for that. The total karma score is (how long you've been on LW) (how often you post) (how much people like what you say); it says something like "how much you contribute to this site", which I find much less interesting, and I personally don't care if it's accurate.
I am, in fact, accusing people who downvote all posts by one person as using their time incorrectly; there are so many other things they could be doing that would make them happier and better-off, including nothing at all, that there's not much excuse for going through with it.
If my karma were reduced to zero, I would continue carrying on as I do now, commenting on this and that, and my karma would from then on be a positive number I don't pay attention to. A phlegmatic disposition has its advantages.
Several people posted recently in a thread on women, mostly espousing feminist views - only to find that someone had declined to respond to their post, but instead browsed their history and downvoted every single comment or article they had ever posted.
I have two questions:
1. Why would you come to a site like this and pollute the karma system? How does it make you smarter? How does it make anyone else on the site smarter?
2. What would be a good technical workaround? In my mind, some system that detects mass-downvoting and flags a user for review would be preferable, but what should happen then? Should the system be more lenient to higher-karma posters? Who should perform the review process? What should be done with those whom the reviewer ascertains are abusing the karma system? I would prefer some kind of lesson that is more corrective than retributive - it seems to me that people who would perform this behavior are exactly the sort of people who need some of the lessons that this site provides. Any ideas?