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According to Dang, downvotes on HN are for disagreeing with ideas and opinions.

• mrslave 6y ago
  Interesting. There's an obvious conflict of interest in reducing another user's karma risks their ability to also downvote. (Of course, just because it's imperfect doesn't mean it's a bad system.) If this is the intended usage then perhaps it would be fair to expand downvoting rights to other users?