Yeah, the witnesses encourage everything to counteract healthy ways of thinking and dealing with things. Instead of really dealing with the problem, you are told to "pray more" and/or "wait on Jehovah"! And to really make someone crazy, they tell them it is them ...and they are not doing enough to trust in Jehovah.
I also think they exasterbate more serious mental problems with their persecutorial complex. "Everyone is after us! Trust no one that challenges Jehovah's borganization"! What a perfect place for a paranoid schizophrenic!
I tend to lean toward the thinking that if you weren't crazy when you joined the witnesses, you soon became crazy afterwards!