Anger is a powerful force in politics and there's a lot of it about. Donald Trump, Brexit and a host of populist movements have been fuelled by anger with the way things are. Where does it come from? How best to respond? One much discussed, provocative perspective comes not from a politician but the Canadian clinical psychologist, Jordan Peterson, whose defence of traditional values has won him a worldwide following. Is his diagnosis liberating or dangerous?(Photo: Dr Jordan Peterson. Credit: Carlos Osorio/Getty Images)