ME12345:
Two corrections. “most of these teens need serious physiology” You meant psychology. Lok up definitions.
You wrote: “Most otd teens went off because of their parents.” I would not generalize like that. Most OTD went off because of experiences with adults. I cannot cite any statistics, but it is close to a draw between parents and chinuch. There is plenty of inadequate, even bad, parenting. True. There is also a huge amount of abusiveness in chinuch. No, I am not making a mountain out of a molehill.
Let’s start with a personal question. How many of your rebbeim from your elementary and high school years do you still keep contact with? If any, why not the others? Keep your answer to yourself, but it will tell you something about that rebbe that remains with you. That is real chinuch.
Next, there is hardly a day during which a yeshiva experience involved not a single instance of a member of the hanhala embarrassing a talmid. Yes, public shaming. Some cases might have been particularly severe, others not so dramatic. But the impact on the child can be lasting and deep. These occurrences are very far from rare, and do not even qualify as uncommon. This is tantamount to emotional murder. Once you have been shamed by a rebbe, you will never revere him again. Children also generalize to all adults. Maybe one rebbe was the culprit in this, but the child is apt to consider all members of the hanhala guilty. This is not a simple issue. The Rambam refers to the use of shame as a tool in teaching. But if you check out the context of that halacha, it is definitely not a first approach. It is as much a last resort as a potch. But it is popular.
I have heard some hair raising things that yeshiva boys, elementary and high school, have been told. If your child spoke that way to your grandchild, you would be enraged.
There is a lot that mechanchim need to learn about discipline. A good rebbe rarely needs it, if ever. The more use of discipline, the poorer quality a rebbe or teacher. Now, the talmid is the victim of this. And it is not just a rare exceptional case. I know way too many situations in which OTD kids pointed directly to a rebbe, with a long list of alarming events. Most of these events were not when the rebbe was dealing with an OTD kid, but long before the transformation.
Again, no numbers, but close to a draw between parents and chinuch. Either way, the kid is escaping. These kids (as you stated, 95%) are not kofrim, and do not meet the qualifications for complete and final rejection, even if the Satmar pilpul is accurate.