So let's not get frightened when the children read fantasy. It's the compost for a healthy mind. It stimulate s the inquisitive nodes, and there is some evidence that a rich internal fantasy life is as good and necessary for a child as healthy soil is for a plant, for much the same reasons.
There is a thin line between the policeman and the criminal. The best cops are always crossed. The best cops are the ones who are able to think like criminals. But for a quirk of fate, they might have been criminals.