I agree also with John many have been in the religion for decades, they have their social life friends and gatherings, many older ones that came in from the outside gave up their friends they would have to start all over again, they have a new net work of friends at least in the KH, I think its dangerous to tell the TATT to ones that this is all they have.
I think a lot have doubts but push them aside as the KH is still better than they believe is outside, and they are happy just cruising along as many have their families and friend work mates.
There are some that just would not cope mentally or emotionally, and suicide is not uncommon among JW.
The younger ones, or young families could cope. Older Single ones I think should be left alone.