[8note]

Debunking makes people believe the thing more favourably. It's the same psychological trick that makes advertising exposure work. If you hear more about something, good or bad, you like it more.

People are not rational beings who will disregard an idea because it is incorrect. The debunking is instead an attack on the person's identity or one of their friends. What you really need to do if you disagree with somebody is befriend and get them to have an emotional attachment to the same ideas you do