defender,
While your analysis is accurate in that subjects of the WTS dictatorship are there willingly, and ardently defend it, it is also true that those who want to leave are free to do so. In fact, the Witnesses are anxious to immediately eject opposers from their ranks. This is one of the ways that they protect themselves. (Or rather, it's a way in which their God protects them.)
Infiltration by opposers would be an effective way to bring down the organization, but it would have to be a fairly massive infiltration, lasting and growing for many years. I don't know of any ex-JWs or other opposers who would be willing to participate in something like that. We all have better things to do with our lives.
Although it is difficult and traumatic, those who discover the truth (as we here see it) about the organization may leave, and often do leave. We here can help these people gather the courage to make the break, and help them clean up the mess afterward and create new lives for themselves. This is a good service. We are serving the cause of humanity, and of love, justice, widowm and power, which is to say (for those who are religiously inclined) God/dess.
Maybe there is a way to organize those who become opposers-in-spirit, and for whatever reasons, choose not to leave.... Maybe this is already being done. Is anyone aware of such an organization of opposers within? It seems that it would be extremely difficult to maintain an effective organized oppositional effort, under such circumstances. And what could be done to cause trouble from within?
George