I tend to think of downvoting as a mechanism to signal and filter low-quality content rather than as a mechanism to 'spend karma' on some goal or another. It seems that mass downvoting doesn't really fit the goal of filtering content -- it just lets you know that someone is either trolling LW in general, or just really doesn't like someone in a way that they aren't articulating in a PM or response to a comment/article.
Below is a message I just got from jackk. Some specifics have been redacted 1) so that we can discuss general policy rather than the details of this specific case 2) because presumption of innocence, just in case there happens to be an innocuous explanation to this.
So... thoughts? I have mod powers, but when I was granted them I was basically just told to use them to fight spam; there was never any discussion of any other policy, and I don't feel like I have the authority to decide on the suitable course of action without consulting the rest of the community.