I am aware of how, in common with other Cults and High Control Groups the J.W Org achieves this state among its members, but how on earth do we open such a solidly closed mind ?
I'm no expert in the matter, but another angle to look at it is not just what you have (rightfully) mentioned on mind control, but also from the angle of abuse. A lot of what they do is what they call "spiritual abuse".
The effect of not being able to get through to a person in that state is very similar to "battered woman syndrome", which protects, rationalizes and defends the abuser, in this case being the spiritual abuser.