I noticed that for most JW's, logical reasoning will not do the trick for them. I tried with my partner and it often leads to heated discussions. Moreover, it is the social life they have in the organization that motivates them And most of them have a sense of fear for the Father. Add the 2 together, and you have the reason why hardly anyone will be motivated to leave the organization because of the many changes in doctrine etc. It does not affect them. They meet their friend every week (3 times or more), do things together, they trust each other and believe that the Father will be happy with them. They reason: the gb cannot be that wrong if 8 million people globally are joined together.
And yes, I can provide many valid, reasonable counter arguments but that simple will not do it. Until now, I would not know what the silver bullet would be......