I like the idea of teaching them to be able to think critically. Other than that, it's hard to convince them to leave. They have to figure it out themselves.
After all, who's to say they would have a "better" life outside the Org. I'd hate to be responsible for convincing someone to do something and find out they were miserable.
One of the things that helped me fade was realizing that most attending were there because of the social support system.