Because we all know that there is Downvote trails and the people who want to give their SP for that know that. But those two are curation project and I am not sure if all the delegators know what the power is used for.

Downvote curation is even more important as we've seen what happens over two years when that doesn't exist, curation projects not using their downvotes are cowards and show how little they care about the greater good of Steem and mostly just about their own safety. Curation downvoting not only costs us time without anything in return for it but at the same time gets you retaliation and endless arguments by idiots wanting to live in the past and constantly receive higher ROI than honest curators.

I don't even know why I'm bothering to reply as I know there is no change in hell you'll understand what this is about and even if you do you won't admit to it.