How do kids end up in state care?

How is it that a child comes to be taken away from his or her parent?
Broadly speaking, there are a myriad of official reasons, but the most obvious, as laid out in Ontario’s Child and Family Services Act, is for the child’s protection.
The child may have suffered physical harm from the person in charge of them, that person may have failed to provide adequate care or supervision, or the investigator may have detected “a pattern of neglect in caring for, providing for, supervisi