theonlyoneleft - "...why not also have a department that helps people with their mental health?"
Because said department would inevitably discover that their mental health problems were worsened - or even caused by - the Watchtower worldview, ideology, and subculture.
Back in the 90s, there were actual hints that Org was quietly looking into reports of emotional health difficulties and depression amongst the R&F (particularly women)... until, all of a sudden, it stopped...
...and they made the blanket statement that "Jehovah's Witnesses are the happiest people on Earth (period)".
And virtually nothing more was said.
Ten bucks says that the evidence was mounting that - as I said above - it was being a Jehovah's Witness that was causing the problems...
...which would have obviously been completely unacceptable to the WT leadership.
So - I suspect - they made the decision to double-down on what was already set in place, rather than reform... and accept any losses that would stem from it.
(EDIT: not unlike their response to increasing reports of child abuse, I might add)