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Re:Ask YC News: Voting up vs. up and down by imsteve on Wednesday September 19, 2007 @06:46PM (#57100)
The best reason is because downvotes piss people off. They have been the cause of more flamewars on reddit than anything else. When you know you are right but everyone is downvoting you and upvoting the "wrong" guy, I know very few people who won't react aggressively.
Re:Ask YC News: Voting up vs. up and down by oditogre on Thursday September 20, 2007 @03:34AM (#57292)
+1 (Insightful)

This is why democracy + free speech (in theory, at least) works. No matter how unpopular, a voice cannot be silenced. If you don't like a person's viewpoints, you can't shut them down by downvoting them; you can only upvote the viewpoint you do like, and / or present your own position yourself, if no one else has done it.