How to Talk to Someone Who Refuses to Accept Reality, According to Behavioral Science | Inc.com
You need to show the other party that his beliefs are actually in conflict with his own values and goals, all without making him defensive. It sounds like a tall order, but Tsipurksy insists it is possible. Offering concrete examples of people who have changed their minds can help. So can suggesting that a person's previous opinion was understandable given the information he or she had at the time.