DY:
You wrote “Why do you assume that it’s within anyone’s power to prevent someone from making bad choices?”
I don’t. People have personal responsibility for their behavior. But there is a longstanding debate whether the chinuch input that is believed to be at fault for the OTD phenomenon is the flaw of the parents or the yeshivos/schools. Everyone volleys the responsibility to the other. In reality, there are usually a variety of forces at play, and I don’t give a pass to anyone.
The typical response of the Rov is that the parents are at fault, as no Rov wants to go on record as holding a complaint against yeshivos (all of them or a specific one). In fact, it is difficult to ever take a yeshiva to Beis Din, as almost every single Beis Din refuses to accept such cases. They fear the backlash if they were to pasken against a yeshiva. However, if this typical Rov blames parents for flawed chinuch, how would he explain his own child that is OTD? No one can overlook personal choice. But parents and yeshivos have considerable input and influence over young people.
So the question still remains. Is the Rov qualified to guide decisions in matters of chinuch?