If children can't decide their own care, abusive parents might prevent them from getting needed treatment, or might stop them from reporting abuse by committing them involuntarily to mental hospitals, she said.
Note that the presumption here is that the parents are abusive. The law is designed to prevent the parents from abusing their children, as if that is what parents normally do. A law that presumes that parents love and care for their children would grant the parents authority over minor children and include a provision for revoking that authority if parental abuse was suspected.
If you ever wonder how the state views you as a parent, this law should be Exhibit "A". As far as the State of Washington is concerned, a parent is presumed to be abusive until proven otherwise.
The Court didn't decide, the State Legislature did. The Court upheld the Law as it stands. No less a tragedy. Blackbird.