Three children are now dead after their parents started using techniques from Michael and Debi Pearl's books. Hana Grace-Rose Williams died of hypothermia and starvation after being left outside all night. Before her, Lydia Schatz was beaten to death, and Sean Paddock was suffocated. The "disciplinary" tactics these books teach are actually abuse.
These are horrible people, and they give Christians a horrible name. I have absolutely no patience with those -- because, believe it or not, there ARE those -- who try to argue that you should use the good parts of their books and ignore the rest, or that the parents must have misinterpreted the books. No. Three children are reported dead, and others badly injured, and they may not be the only ones. That is not misinterpretation.
If you know someone who owns these books, please tell them about this. It's frightening how easily people can be deceived.