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Im not sure about it being quite like that, but flagging as sabotage has to be punished in some way as well I would think.

Looking at the @asshole and @blacklist downvotes, they're being made at -1% only, so it's barely any negative rshares on the posts they vote. If someone's downvotes are malicious and a problem, @anyx has set up the @seraph bot to counter their votes.