This was something that I never was comfortable with, particularly as my wife was one of those unusual persons whose IQ is clean off the top end of the scale - which is set at 200. (That her talents were completely wasted with the JWs is another story!)
My first introduction to domestic violence was with the JWs. I will say that in that particular case, the wife was not after equality in the relationship, she wanted to dominate -and in a non JW family, she definitely would have (thus making her husband well and truly "hen pecked"). However, the elders leaned heavily on him to excercise his "headship", even to the point of suggesting he use his fists to emphasize who should be in control. (One elder's exact words were that this husband "should clobber her.") If this wasn't exactly giving official sanction for violence, it was certainly telling that brother that the elders were going to look the other way when he used it.
Needless to say, the results of all this pressure was predictable.
The greatest irony of the lot, in my opinion, was that book the WTS printed in the late 1970s, Making your family life happy." The JW way of life is almost gauranteed to do the opposite!
Bill.