I'm also one of those target. Literally every comment I have ever made has been downvoted, 10 downvotes a day, for a few months. This happened until whoever was doing it reached my oldest comment. Recent comments are also downvoted.
Not only is mass downvoting feel pretty terrible, it also messes up the purpose of voting. Voting is meant to be a signal of how useful the community thinks a person's comments are, and that's no longer true of my votes or any other victim of downvoting.
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.