Rubbish replies should be actively downvoted

Previously voters were discouraged to downvote. Has this changed? If one person takes it upon themselves to downvote a bunch of rubbish comments, how will they be affected for doing a good deed? What if we had an option to "flag" a comment as inappropriate and if enough flags were clicked the post was automatically downvoted by the Steem system instead of the users voting power being affected by the downvote? Although I'm sure a system like that could be abused.