Some of my thoughts on this, I don't play the stress card too much, I hate the spiritually weak, moniker (i think you get it no matter what), but I tell them I am happier than ever, and that I was depressed when i was turning in hours and worried about nonsense.
I think the mentally diseased is 100% their fault or lets say 50/50. For me I was born in, I feel i would never have got involved if I wasn't. So lets say you join, I wouldn't call it disease, but being ultra religiously devout (cult) is like a mind virus, when you wake up, it does make you feel unstable, sometimes you flip out and lose your temper, you become obsessed with understanding real truth and it messes you up, then you get shunned and that makes you crazier. So I think the "mentally diseased" part comes from the effects of leaving a cult and losing your zen. When we appear to the RF zombies as obsessed and raving mad, because in some ways you do, and justifiably so. Important thing is to fight it.