If downvotes are used only to fight abuse, I think that they are necessary but unfortunately it's not always the case. If you downvote people without giving them the reason, how can they improve their behaviour?
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I agree. I believe this should be "fixed" on the front-end side. Instead of a downvote button, there should be a "downvote and explain", much like a normal comment, except it would be comment+downvote. I guess someone could still manually still make a downvote only through the front ends if they leave the comment box empty.
That would be a great idea to implement I belive.