Are Jehovah Witnesses psychologically stable?

Now, don't get me wrong. I think people have a right to worship as they see fit. But, I overheard a tape by a psychologist who sees a lot of ex-JWs. Wow, what I heard was scary. I won't go into a lot of detail; but, this psychologist almost broke down and cried becase of the mental stress/confusion that some JWs have underwent in their religion.