All these points are sad but true.
Yet another factor I believe is in the mix, at least for those who have converted into the faith. And that is, many of these ones have become a Witness because they are unable to make sense of the world around them. Perhaps they are grieving due to the loss of a loved one and are unable to move on. Maybe they have been involved in some natural disaster, lost everything and cant reconcile that event with their views on a loving God. What ever their life story, the 'Truth' provided them with a frame of reference that has helped them make understand the world and where they fit it to it. Unfortunately its fake. And when the reality comes crashing down on them for whatever reason (be it through fellowshiping or some other form a awakening) they are unable to mentally cope and they are in a worse situation, then when they started.
This is because the Organization is great for one thing; destroying peoples confidence in all the other world's religions. But when it becomes clear that even it is just another man made religion, they have nothing to latch onto ... and are left drowning in the sea of reality.
no-zombie