They never mention they could’ve been wrong. The author assumes they’re always right, but that trying to convince others and argue them to their right side is not valuable. How about: maybe I’m wrong and I didn’t let their ideas influence me. How about: even when I think I’m right, it will be better to calmly kindly discuss, listening as much as talking, not debating or arguing or speaking over them, but attempting t…
I don't think we've solved the problem of what to do with evil people that are too smart to pretend they have been rehabilitated. So, an amicable chat with them won't really win them over.