My doctor told me the difference in neurological brain disorders and psychiatric brain disorders. Both are physical. What makes a brain disorder psychiatirc is that things in the actual world impact the illness. Neurological diseases do not get worse with crummy circumstances. It makes sense that JWs would have a very high percentage of mental illness.
I recall when there was much shame among Witnesses attached to taking any psych meds. My aunt and uncle were very close to a sister who had to take the earliest antidepressants. It was not a neutral topic for them. The Holy Spirit did not matter. In this system of things, bad things will happen. Of course, she pioneered. Could not work. If I had a $ for every Witness too sick to hold down even a part time job who pioneered, I'd be very wealthy.
When I see therapists about trauma, they ask about my family background in the screening interview. They interrupt me when I explain that my family were Witnesses. They tell me they cannot help me. I will have to go elsewhere. It is only when I reveal the full extent of my wrath that the interview continues. Everytime they happened it was from past experience with Witness clients. They allude to control of the WTBTS and family turning their back on members who truly need help. Combine that with Armageddon, blood, and demon fear, plus overwork with meetings and field service, the most resilient person would be depressed.