[*] Psychology as an analog to medical science is also a con job. Psychotherapies don't need to prove efficacy in clinical trials like drugs do. Whenever anybody does bother to do a study like that though (again -- purely voluntary) therapy never shows itself to be very effective at doing anything. But especially not for people with personality disorders.

A minimum of progress could avoid, for example, the abusive parents calling the social services, and/or going to court, and/or receiving a restraining order.

There's lots of behavior that therapy can (potentially, of course) at least mitigate or teach to handle.