I think you are being generous, Cronos. Much of what they post is not simply error, but blatant lies. And often lies on which they've been previously corrected. I don't think they care if what they post is truthful, as long as it disparages the belief of another.
Possibly, but they are misled sheep. We can only point them to the truth — if they wish to still be blind to it, that is their free will. People find it easier to wake wide-eyed along the narrow path to hell.