If I cared enough about the space to make a karma-based threading system, I would attempt to come up with a way to differentiate disagreement with contribution score (aka karma).
Sometimes people feel the need to register disagreement but can't be bothered to write a specific reply as to why, and while it sucks that many people do that via downvoting the contribution score, it is understandable why they do it and there is probably a better fix for it than just telling them they shouldn't do it (they won't listen).
Sometimes people feel the need to register disagreement but can't be bothered to write a specific reply as to why, and while it sucks that many people do that via downvoting the contribution score, it is understandable why they do it and there is probably a better fix for it than just telling them they shouldn't do it (they won't listen).