The wider issues raised by last year’s Bill Henson affair were elegantly stated by the philosopher John Armstrong in the Australian: “For a long time art has lost its way, and this is a disaster not only for what is called the art world, but for the whole of society. The loss is so deep and has developed over such a long time that we can hardly grasp what the problem is. “The true task of art is to show us ideals, to present in a compelling visual form what we should be: our best selves. Its task is to…