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The problem I have with downvoting is there's sort of a positive-feedback network effect: if you see an answer that's got a +1 response, you're much less likely to downvote it than if you see an answer that's got a -1 response. Conversely, if you see an answer that's got a -1 response, you're much less likely to upvote it than if you see an answer that's got a +1 response.

We can be like vultures, unfortunately; when more than one person votes down a question it becomes kind of a free-for-all. (DIE, YOU SCUMSUCKING BAD ANSWER!)

I only vote down people if their answer is either malicious or significantly misleading. If someone gives information that's way off track and wrong, they might get a -1 from me. If they gave an honest attempt but missed a little bit, I'll comment but that's it.