I have around 10,000 almost entirely from commenting on posts over three and a half years, it's not hard. I would assume someone with a long-running grudge. It's difficult to think of a worse (appropriate) punishment for them than continuing to be someone who would think this was a worthwhile way to spend their life, however.
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.