In The Lord of the Rings, Frodo said of Saruman:
He is fallen, and his cure is beyond us; but I would still spare him, in the hope that he may find it.
In The Ten Commandments, Rameses said of Moses:
Let him rave on, that men will know him mad.
Whenever I encounter someone who is being wrong on the internet, one or the other of these statements comes to mind, and I remain silent.