Tomorrow is the first of May and there will be the usual riots in the centre of Zurich. Rich, privileged, teenage kids will cover their faces and run around trying to look tough and impress their friends with a little bit of bravado by facing off the riot police. Kind of like the rap artists they listen to, except they never experienced deprivation or neglect; instead they live in a city with a very low crime rate, where poverty is rare and where the police are strict but fair. There is little to rebel against. So to the smell of tear gas they will run around and get rid of a little testosterone.