That's interesting nicolaou that your doubts were prompted by a particular circumstance and turn of events that could easily not have happened. The person who prompted your research, I guess he also left JWs?
It makes me wonder, because generally I agree with you that you can't make a JW reevaluate their beliefs who is not ready to do so within themselves. At the same time, chance encounters with disconfirmatory information can often make JWs think. Both of these propositions seem to be true.
Which makes me think that the best way to combat the Watchtiwer society is not to confront JWs head on, but to make information about JWs readily available where JWs may bump into it of their own accord. Which is what many of the best activists like Paul Grundy are doing with their websites, and in the old days when people used to make sure local, libraries had copies of Crisis of Conscience. I wonder if there are yet more ways of making information easier for JWs to stumble upon. That's where energy should be focussed.