Greetings and Welcome, Adolfius!
It's good to have you on board; I appreciate the manner in which you posed the question - you are merely inquiring into motives you cannot understand. I could have written some of the posts already here. Many of us are in such delicate situations that real emotional and psychological harm could come to LOVED ONES were we to speak out - boy, do we ever want to! I've been there, done that personally, i.e., suffered from shattered faith, and am well into recovery.
There is a high incidence of mental illness among JWs, either induced by or aided and abetted by the entire complex structure of what makes the WTB&TS what it is. Many friends and family are on the edge already due to this illness and are on meds. Suicide - mentioned earlier - is a very real and frightening fact among those whose life is suddenly ripped away from them. I am here at JWD for myself but, in large part, to learn how to help those who one day will learn the real truth about the lie and need me. I'm already at it.
By the way, there is a distinction between "brainwashing" and "mind-control." The former, as I understand it, may employ torture to get the victim to renounce God and country, as it were. But he may escape his tormentors and return to normal life and belief. That's pretty simplistic, but it's what I remember from something I read last night. Mind-control, as employed in cults, branches into thought, behavior, emotional and information control. One of many links on the far-reaching effects of mind-control can be found at www.escapefromwatchtower.com/mind.html. Also, www.freeminds.org/psych/BPD.htm is a dandy:
"It is either the Watchtower's way or no way at all. [...] if we did not live up to what the Watchtower organization set before us to live, then there was no real reason for living anyway because we would only face destruction at Armaggedon close at hand. This is one reason that [some] Jehovah's Witnesses have committed suicide."
I hope you are well and have a great weekend. I'm sure you'll be getting a lot more replies to your question!
CoCo