Parakeet,
sorry for replying late, i've been away for a week.
Because a dub without the mind control isn't really a dub. He's a soon-to-be apostate with horror stories to tell.
Unfortunately, looks like you're right to a large extent, although I won't go as far as making it a general rule since I'm not in other people's shoes. I know of a few quite well educated JWs (a doctor, a high ranking music teacher and an engineer, for example) who are trying hard to keep balance between genuine adhesion, self censorship and free thinking. Don't know how long it can last. As for me, I've been a JW for 30 years and I'm now marked in the congregation for my apostate and "negative" expressed opinions. I feel like being a satellite orbiting at very high altitude, which a very small acceleration will send free of the attraction of this organisation.