They are mandated to report child abuse. It is the same story with doctors, if an abusive parent brings in a child for care they learn never to give the kid healthcare again after the doctor reports it. It is rooted in good intentions but the effect is it means abused children never get to see doctors, therapists, get a half-ass minimal homeschool instead of going to school, etc so that mandated reporters never enter the picture.

> No matter how or why? That seems like a terrible mandate.

Honestly shocked that anyone would even say this, but even giving you the benefit of the doubt here -- the one case where I could imagine this might not happen would be if you're a police officer investigating such cases. But they also have their own therapists dedicated/trained in police-specific issues.