I feel like this shouldn’t be added at all, and here are some of my reasons:
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Abuse: It’s going to be abused, and we might start having problems with “vote brigading” (just google “vote brigading” and you’ll see what I mean by that, but if you want, vote brigading (per my definition at least) is when you get a mob of people to upvote/downvote something en masse regardless of agreeing or not to what they voted on, a blaring example is Reddit which often in the past had to deal with vote brigading. See here: Vote brigading - Wikipedia)
Note that this might be confused often with “review bombing”, the two practices are very similar, but review bombing is purely to hamper a product’s reputation. -
Bullying: when you downvote a specific user just to harass them regardless if what they say contributes to the discussion or not), and given that downvotes are anonymous…
Moreso, this forum is more of a discussion board (per @wravager’s statement) and not Reddit nor Stack Exchange (which is more geared towards a Q&A system).