I would like to see justified downvoting implemented instead. For example users should be able to counter-argument (as in a different reply mode) a post/comment

I would like to see justified downvoting implemented instead. For example users should be able to counter-argument (as in a different reply mode) a post/comment, in that case If the counter-argument gets more upvotes than the parent post/comment then the parent comment should start greying out like it does here. Of course this doesn't even try to fix sybil attacks but I still would prefer it.