I was thinking more mod/admin efforts. I've never apparently been the victim of mass-downvotes, but if there was an intervention to remove all downvotes made by a troublesome user, the sudden removal of all their cumulative downvotes over time might look like an unexpected karma boost.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.