Well, I suppose the original idea was that they are for low-quality stories and comments, not for expressing disagreement.
Low-quality, off topic, don't make sense, violate site rules, rude, abusive, being a jerk, shill, propagandist. Disagree is actually the least negative reason to downvote someone.
alt Hacker News
Low-quality, off topic, don't make sense, violate site rules, rude, abusive, being a jerk, shill, propagandist. Disagree is actually the least negative reason to downvote someone.