Children have long been one of cinema's largest audiences yet, from its infancy, cinema has in the minds of moral watchdogs accompanied a succession of pastimes and new technologies as catalysts for juvenile delinquency. From 'penny dreadfuls' and comic books to television, 'video nasties' and computer games, and more recently, gangsta rap, mobile phones and the Internet - all have been seen as threats to children's safety, health, morality and...