Perhaps you could disable downvoting functionality for those with a karma ratio lower than 75% or 80%?
"Please provide proof of your complete integration with the hive-mind before being allowed near the downvote button" X-D
Lumifer, your karma ratio is 80%.
I'm only at 70% because of massive downvoting from Eugene Nier, who may very well also be VoiceOfRa. I'd be at over 80% just without Nier's downvotes, even not also excluding VoiceOfRa's downvotes.
The solution to downvoting is not to make it easier to hurt people like me with downvotes.
I've gotten sufficient evidence from support that voiceofra has been doing retributive downvoting. I've banned them without prior notice because I'm not giving them more chances to downvote.
I'm thinking of something like not letting anyone give more than 5 downvotes/week for content which is more than a month old. The numbers and the time period are tentative-- this isn't my ideal rule. This is probably technically possible. However, my impression is that highly specific rules like that are an invitation to gaming the rules.
I would rather just make spiteful down-voting impossible (or maybe make it expensive) rather than trying to find out who's doing it. Admittedly, putting up barriers to downvoting for past comments doesn't solve the problem of people who down-vote everything, but at least people who downvote current material are easier to notice.
Any thoughts about technical solutions to excessive down-voting of past material?