Just to play devils advocate: Daryl Davis. A black man who has convinced over 200 members of the KKK to quit, by having civil conversations with them.
Edit: he directly convinced something like 50, but estimates more than 200 have quit because of his efforts
I didn’t mean to imply it was a 1-1 comparison. I just used it as an example of a situation where a person or group of people were taking part in something really terrible, and were talked out of it by someone who was actually willing to take the time, and put in the effort. It can work. Not saying it always will in every situation, but it can.