Many people who post on here happen to like the online community. They are not necessarily bitter anymore. Many have been out for a long time. Some have family still in the religion and are concerned for them.
Also, because of the secretive nature of the Jehovah's Witness religion, this and similar sites provide a very much needed place to come and vent and also to read about other people's bad experience in the religion. When I was in a crisis state and isolated with nobody to turn to, the many sites online plus the book Crisis of Conscience among others really helped me.
I can't imagine why anybody would find anything wrong with this unless they are annoyed that the JW religion is being exposed. In my opinion, they are not being exposed enough!