Even if Facebook does everything right, and moderates every single thing they aim to moderate, they will still be blamed by conservatives and/or the alt-right if they censor too much, and by liberals if they censor too little. There is no type of moderation that will make all sides happy.
Is this one of those mirror universe things?
In the 2000s the extremist conservatives wanted to censor everything (mostly due to religion) and liberals wanted freedom of expression.
Now it seems that extreme liberals want to censor "hate speech" which is absolutely valid, however the lines are moving or getting blurry to the point where they want to censor conservative ideas altogether, and conservatives want "freedom of expression".
I've seen this shift and I'm sure many others have as well.