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.
Desrtopa makes a good point. The problem is less with downvoting all of someone's posts, and more with downvoting all of someone's posts without good reason. If there's going to be a rule it should target the latter: mass downvotes that can't be justified on the basis of the comments' actual contents.
In any case, formalizing a rule might be overkill. One person could well be responsible for block downvoting not just ialdabaoth but also daenerys, NancyLebovitz, shminux & Tenoke. Five minutes of database access would suffice to check that, and if all this downvote spamming is just down to one person, taking away their downvote button ought to do the trick.
There's another reason to check: right now, we have an outstanding accusation against a respected user in the community . That user has not responded to that accusation. In a court of law (at least in the US), that would (generally) not be allowed as evidence of guilt, but from a Bayesian standpoint it does seem like P(Eugine Nier is systematically downvoting|Eugine doesn't deny it)> P(Eugine is systematically downvoting|Eugine denies it).
Now, there are other plausible explanations also for why he has decided not to comment, and at this point, I'd as... (read more)