"very heavy form of disapproval"

Please don't do this. It's not the purpose of flagging and screws up the site mechanisms.

The site has no appropriate way for users to deal with stories they disagree with. They can flag, which cause problems as you describe, or they can make negative comments, which are supposedly the big reason HN is going downhill. Correcting individual cases will not stop this until an appropriate outlet is given to express this.