Curation is about incentivizing stakers to actually vote on content which they believe others would agree is appealing by rewarding them for it.
I have not seen that very much in the past almost two years I have been here. There is no incentive to find good content, if that was the case then there would be many more post that get voted on day 4 or 5 and that simply does not happen. Even the post that are on the trending page rarely get votes on day 3 or 4.
I have yet to see a post that was on the trending page be down voted other than @haejin. All incentivizing downvotes will do is lead to more bullshit down vote and tack on downvotes such as what the @mack-bot does. @mack-bot does not stop punishing a person at all from what I have seen. A downvote is for a piece of content, or an excessive reward or the other reasons listed.
What purpose does a forever downvote serve? You are no longer downvoting content or reward, you are downvoting an individual when that is allowed to occur. If an individual is that bad then steem should prevent the account from posting anything at all. If they can do an account recovery then they can do an account rights to post take-away.
I have yet to see a single solid reason for rewarding downvoting. It does not matter what the community wants in regards to downvotes, it will be incentivized simply because it provides another method for the stake holders to make more money. Downvoting has never been about a post payout. It has been about bullying and someone getting there way for the almost two years I have been on steemit and posting to the steem blockchain.
Downvotes are not about content quality either. it is about a bullies idea of what should or should not be allowed thought wise on the steem blockchain.
But we will never see eye to eye about downvotes and how they are used on steemit, I will see them the way I do as bullying and you will see them as you do about rewards and content quality.
Blacklist do not work, and should be banned.