I don't think showing comment scores would add anything to the quality of discussion on HN. As it is currently, I've noticed an uptick in lower-quality comment

I don't think showing comment scores would add anything to the quality of discussion on HN. As it is currently, I've noticed an uptick in lower-quality commenting (jokes, puns, baiting, poorly thought out responses, etc). I like HN because there are a variety of perspectives, but a good majority of them come from people who want to have quality discussions. Showing comment score would entice people to comment what will be popular, not informative or discussion worthy.