I suspect it’s basically brainwashing. “Only we can save your kid, only we have the knowledge and skill to save them and give them a normal life. You love your kid, right? You don’t want to damn them to an autistic life of failure, do you? Only we can save them, only we can save them, only we can save them…”
Not sure why the police always, always, always side with the institution of wealthy child abusers, though. Oh, wait, I guess I answered my own question. 
