It's basically how I can moderate my own Facebook, I gave up trying to explain things to people I grew up around. I've had people freak out on me which was followed by their friends telling them how disapointed they are in them instead of admit they were wrong. The things my friend sees shared on his are actually hilarious, like apparently it's wrong to sing the national anthem in our public schools now in Canada but muslim prayer is okay ? The people who posts those things aren't intelligent enough to understand how wrong they are, you could stick them in a classroom full of students standing for the anthem and they would ask why you were there even though you explained it like 5 times.
And that is why no moderation leads to the weird kind of right wing, because they are more stubborn and loyal to their crap than leaf fans.