I've been told that the positive function for indicating spam is not the only reason the down arrow isn't used for regular downvoting. It's also because they don't want differing opinions silenced.
So my suggestion has been to allow downvoting that doesn't (a) negatively impact the user's overall site score, and (b) doesn't change the comment's rank in the thread. I think people need to be able to voice their disagreement, and telling them, "Well, you can argue with them", just doesn't cut it. It's ignoring a big part of why people use sites like this. It's social. We all spout opinions off as a way to release pressure. We need to be able to let steam out by clicking on a down arrow once in a while - it's just human nature. I think it can be done without suppressing opinions.
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