I think everyone realizes that introducing curation means that sometimes the curators will get it wrong. I still think having some curation is better than none.
Before people get mad that Facebook is trying to control the truth, don't forget that their algorithms already manipulate the news and it's been happening for years. Their algorithms prioritize user engagement, which means prioritizing news that provokes conflict and fear and conspiracy. That creates a huge bias, it makes people feel like the world is much more divided and dangerous than it really is.
That's a problem that's on them to fix, and the solution is probably more curation not less. For them to get it wrong on the man-made theory, that's one of the less harmful things they've done so far.