I have seen this as well. Some of people leave and make some really bad choices. I have seen a lot leave who have massive depression and have a drinking problem. We have witnessed several who are on prescription meds and they are NOT getting these meds the typical route. Purchasing them on the black market and in foreign countries. We actually know several that are doing this and they are NOT the average publisher. If you get my drift.
Once some leave, not only do these ones loose all of their social network, they also loose all of their family. Loosing your family is one of the worst forms of abuse. Holding people hostage and ruining families should be a crime.
My spouse and I have realized that we could possibly loose all of our family. We are fine with that. We don't agree with it but could handle it if faced with it. We are strong people with realistic attitudes. I don't believe that the majority are that strong. Some are DF'd and want their family back. They get reinstated and then fade once that has happened. Some who are DF'd still believe that they deserved what was done to them and need to "set it right with Jah."
WT uses these people as examples to control the rank and file. They use fear to keep the sheeples in line. So many JW's are disconnected from the "real world." They have pioneered, been need greaters and have been Bethelites. There are so many who rely on family to support them and just don't have the realistic everyday examples of the good and bad of people (all people).
The movie The Truman show is a fantastic movie for any JW to watch. Trumans life was a TV show and not real. Once he realized his whole life was scripted and fake, he wanted more. A real life. The "protected JW" is the most vulnerable JW. WT tells them how to think, feel and act and they put full confidence in these men.