The kids are probably less safe in CPS care.
About 15 years ago there was a case where a professor at the local university had her son taken by CPS because she tied her son's hands behind his back to prevent him from continuing to hit himself intentionally. He had some kind of condition that caused him to inflict harm on himself and she was trying to help protect him. Anyways, while under CPS care, the kid died because essentially CPS didn't take care of him properly. Whether or not you think that the mother took care of the child properly, you can't dismiss the fact that CPS didn't know any better.