From what I have read, after an individual has been involved in an isolated group for a few years, it is very difficult to get them to question anything. The reason the leaders of these groups try to separate their followers is to maintain control.
Yes, control has been the operative word, post-John.
Lording it over people's lives became synonymous with shepherding or the father ministry.
It doesn't foster life and the family environment, of course...even if a zillion messages are preached to support it.