You don’t like what I say, how will I know why? You downvote because others are downvoting or you are too lazy to come up with a counter argument.
So I propose, if you downvote, then HN should open up a text box asking you to justify. So people will know if it make’s sense. If others downvote that, they should justify that too. So downvote and justify all the way.
Make it so tedious, nobody downvotes.