I can't see the reason being anything else than a personal grudge.
Really?
I can see at least two other (closely linked) reasons for ialdabaoth's providing the name of the conjectured culprit. (1) Two people specifically asked him to do it. (2) Abuse of the LW karma system is damaging to the whole community and everyone benefits if such abuse results in public shaming.
There are, of course, reasons in the other direction (the danger you mention, of such accusations becoming commonplace and themselves being used as a tool of abuse and manipulation; and the danger that people will be more reluctant to disagree with Eugine because they don't want him to do to them what he is alleged to be doing to ialdabaoth). So it's not obvious that ialdabaoth did well to reveal the name. But there seem to be obvious reasons other than "a personal grudge".
Abuse of the LW karma system is damaging to the whole community and everyone benefits if such abuse results in public shaming.
Note there's not even a consensus whether there should be a rule against such usage. What you find to be 'abuse' others may find to be valid expressions within the system of wanting someone to 'go away'. No details, no demarcation line, but calling for 'public shaming'? Please.
Before you say "well it's implicitly clear!", consider 1) suffering from a typical mind fallacy and 2) the precedent that there even was an expli...
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.