Some of these parents are honestly scared that their unmanageable child will kill them or a sibling while they sleep.
What exactly are they supposed to do when they realize they have a violent and sociopathic child?
CPS and foster care isn’t any safer or better.
And that is assuming that the treatment is done by honest and good people which is not something you can assume.
Mostly, with a child that is acting out, the entire family needs work, not just the child.