Actually, the point many have brought up re the person recognizing they need help or that there is danger is true of many 12-step programs. When I first was attending Al-Anon, I thought it was to help the alcoholic. It turned out to be to help me deal with the situation whether they stopped drinking or not. I learned that only the alcoholic (with a higher power) can stop their drinking. They have to see they are an alcoholic and the negative part drinking plays in their life and take responsibility for their lives. Until that happens.....it is likely talking into the wind.
I think that works with JWs. Until they see the problems in their life and the part the WTS plays in them, if you try and point it out to them they won't see it and can get closed off and defensive.
It is better to wait and watch when a situation comes up and they are hurt by the WTS policies and come to you for comfort. Just ask them questions and help them reason. Back up if they start to get defensive. You want them to come back to you for support when the WTS screws with them again, and they will. Be a friend, support when you can.
Blondie