Do you really think that a Whatsapp group is a better option for someone with a problem than a professional counsellor ? Whilst confidentiality is part of the process, any counsellor would recommend he be taken off the roster if they thought he was a safety threat. This could have been done quietly and he could have received the help he needed and been returned to flying status if deemed fit.
By effectively going public with his issues he's backed the company into a corner and they have no other option than to ground him