Your point Cellomould is so true.. i,e. parents withdraw their support and watch their kid's lives become miserable and then saying, "Jehovah has withdrawn from them." In any circumstance or situation if parents did this to their kids, failure is almost surely eminent. Jehovah "withdrawing" from them has nothing to do with it. This is just something the witnesses say to keep an element of "control."
This is just like the threat they told me just before I was disfellowshipped...."You'll be in the world without anyone and Jehovah will withdraw his spirit from you leaving you completely alone for Satan to get a hold of."