I agree with you here, but unfortunately the child or children are often taken from their home and put in homes with strangers. Even if they are lucky, and they aren't abused in new ways, they suffer from the loss of other family members, cherished pets, friends, etc., and the difficulty of being thrown in with a completely different "family" culture. It really is terribly traumatizing. Obviously, it can't always be avoided. Some parents are homicidal sadists, but so are some foster parents.