A socially competent person should have some kind of an idea what accusing people publicly means.
Yup.
That in my mind means that he did it to hurt Eugine, or that he's not socially competent.
Doesn't follow. It means that he did it knowing it would hurt Eugine or else is not socially competent. But a thing can have predictable consequences that are not reasons for your doing it. A medically competent person knows that major surgery causes pain and inconvenience and risk, but that doesn't mean that someone medically competent undergoing or recommending major surgery must be doing it to bring about the pain and inconvenience and risk. They're doing it for some other benefit, and putting up with those unfortunately unavoidable side effects.
(I don't know ialdabaoth. It is possible that s/he did intend to hurt Eugine. But I don't see any good evidence for that, nor any grounds for assuming it.)
But a thing can have predictable consequences that are not reasons for your doing it.
Well, you got me here. I think the expected positive value of the action is so low that using that as justification for the highly probable negative value seems kinda weird. Surgeons don't usually cut people up just because it might have some benefit.
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.