The ability to provide meaningful and respectful feedback is as important as someone who may provoke or try to stir trouble.
I'm curious if YC has toyed with the idea of increasing the right to downvote to have to include a comment, explanation, or reasoning that is not a few characters.
HN is not Reddit though. The maximum downvote count is 5 reducing a comment to a score of -4 and aside from the color fading of negativity scored comments vote counts are not published. The majority of users and discussions are also generally superior to those of Reddit as well.
Even with that said problematic discussions do happen on HN even if far more rarely. The reason for the problematic behavior, as many people clearly identify, is people looking for agreement more than discussion or insight. In this case people on HN engaging conversations only for agreement are generally eager to advertise their censoring foolishness and insecurity.
Aside from contrived political discussions downvotes are generally reserved for comments that are far off topic or impose violating behavior.
Either way the biggest change this would result is visibly associating a user to their down vote. Otherwise, I don’t see this having a dramatic impact on HN. This would have a huge impact at Reddit though.