The problem with social media is that they don't have people telling the public that their ideas are crap, so everyone thinks they're awesome.
Editors get to make sure people understand that, no, they are not awesome.
Social media, like any advertising-driven media, needs editors to tune their site. They're trying to have it all - the profit of big advertising with the automation of tech, but advertisers only want something specific, and automation isn't going to get what advertisers want. No major advertiser wants their beautiful fashion brand ad nexts to a post of child mutilation on Reddit. And editors get to tell people that their content is garbage or great.
And editing means people are going to be unhappy. You are officially taking a certain viewpoint, and are literally filtering out incompatible expression. The people that get edited out, they'll get mad, but they'll have to deal with it, like the millions of other people that get edited out by various editors around the world and deal with it appropriately.
To fix it, Reddit & other social media needs Editors-in-Chief. Just tell the users: "This is the boss. Keep that person happy. Want to be pissy about it? Go somewhere else."
YouTube is now trying that with their kids channels.
In the long-run, things work out better with editors.