Assuming they currently have 1 karma/post on average, which seems low to me, it would only take ~2500 karma to downvote all of David, Tenoke and falenas' comments. That isn't tiny, but for example I'm not particularly prolific and I have ~1500 karma, which I'd expect to be more than sufficient.
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.