I agree that downvote buttons are generally a bad idea. It's hard to even pin down a real meaning to them. Does downvoting mean the post is bad? Maybe it just means you disagree with the post. It's still possible to disagree with a well-researched and reasoned argument. I think something in the user interface whose meaning is "don't show me more articles like this" is better. It doesn't change how other people experience the site.
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