So that it isn't upsetting to anybody. It's something we've always known about fairy tales – they talk about incest, the Oedipus complex, about psychotic mothers, like those of Snow White and Hansel and Gretel, who throw their children out. They tell things about life which children know instinctively, and the pleasure and relief lie in finding these things expressed in language that children can live with. You can't eradicate these feelings – they exist, and they're a great source of creative inspiration.