Since comment upvotes don't yield any reputation, I'm just wondering why comments can be upvoted but not downvoted. I see a lot of comments with flat out wrong information or unhelpful responses, and downvoting could add weight to whether those responses are visible by default, or go under the "view x more comments" expander.
I'm sure there's a rationale, just wondering what it is and why more people don't request this feature.
EDIT: I know there's a flag feature, but I'm more inclined to use that for offensive or off-topic comments. Am I wrong on that?