The former might well bother younger children afterwards, and even give them horrifying nightmares – scarcely desirable in itself – but the latter is more likely to taint their fundamental vision of the world and adult norms of behaviour. The intensity of violence in The Dark Knight is a grimly logical progression from the sort of distilled brutality that has rapidly become the norm in films rated 15 and 18: the only difference is that now small children are permitted to watch it, too.