I'm just tired of the signal pollution, and would like to be able to use karma to honestly appraise the worth of my articles and posts, without seeing 80% of my downvotes come in chunks that correspond precisely to how many posts I've made since the last massive downvote spree.
EDIT to add data points:
Spurious downvoting stopped soon after I named a particular individual (not ALL downvoting stopped, but the downvotes I got all seemed on-the-level.)
One block of potentially spurious downvoting occurred approximately one week ago, but then karma patterns returned to expected levels. I consider this block dubious, because it reasonably matches what I'd expect to see if someone noticed several of my posts together and disagreed with all of them, and did not match the usual pattern of starting with the earliest or latest post that I had made and downvoting everything (it downvoted all posts in a few threads, but not in other threads), so I'm just adding for completeness.
Spurious, indiscriminate downvoting started up again approximately half an hour ago on Sunday (12/1/2013), around noon MDT.
Edit: And now on Tuesday, 12/3/2013, at 10 AM, I'm watching my karma go down again... about 30 points so far.
Edit: And now on Saturday, 12/14/2013, at 2 PM, I'm watching my karma go down again... about 15 points so far, at a rate of about 1-2 points per second.
Witch hunts are characterized by lack of evidence; that should not be the case here. The admin in charge of the system should be able to pull up the relevant data, do ten minutes of analysis, and say definitively yes or no whether there's abusive downvoting going on.
If there is, I'd like to see action taken, because karma is one of our better quality indicators on the site.
You're right; I guess it's not the witch-hunt side so much as the ad-hoc mob rule that bothers me. I express controversial views on LW, both through my posts and through my moderation; I think the fact that one can do so is one of the most valuable things about the site. The idea that one could be severely punished for an action that didn't violate any specific rule, but was merely something many in the community disagreed with, would be very chilling.