What are David McClean's observations of the family in "The Veldt"?

David McClean is the psychologist that George and Lydia Hadley invite to look at their nursery. He thinks that George and Lydia have spoiled their children "more than most." He also says that they have let their nursery replace them as parents. "This room," he says, "is their mother and father, far more important in their lives than their real parents."
Although he says that George and Lydia have spoiled their children, David McClean also says that by punishing their children, George and Lydia have changed from "Santa Claus" to "Scrooge." He criticizes them for this, remarking, unhelpfully, that "Children prefer Santa." The fact that he seems to contradict himself, criticizing the parents on the one hand for spoiling their children and criticizing them on the other for punishing them, suggests that David McClean's observations of the Hadley family are not worth paying too much attention to. He is a foolish, pretentious character, and we are probably not too sorry to see the vultures circling over his head at the end of the story.