S ome years ago, there was a TV advert for the Guardian newspaper, which became an advertising classic. It showed a young man, short hair, tattoo, drainpipe trousers and bovver boots, pelting towards an old man ambling his way down the street. When the lout catches up, he grabs the old man and flings him down, clearly a vicious unprovoked assault. But then the camera moves back to show the whol...