You are welcome to your opinion, tula.
However, the medical field as far as psychosis was in it's infancy in the early '70s.
The question raised is if possibly the stress of being a Witness could bring on psychosis.
It is now known that psychosis is a functional or organic illness. It is brain damage or disease.
It would be like asking if being a JW could be responsible for ones getting cancer.
Surely you can understand this.