Guardian: When I was a student at Edinburgh, we used to protest at the career fair every year. One time, Esso [ExxonMobil] had got someone to set up their stall, but their staff failed to show up. My sister and I put on our best suits and staffed the stall for the morning, giving students an honest appraisal of what it was like to work for a company whose work is bound up with brutality, corruption, murder and planetary destruction the world over. After hours of these conversations with students, the poor...