When I was young, a truck full of chocolate bars lost its load a few streets from my house. By the time the police turned up – which was, annoyingly, long before I found out about it – the cargo had gone. People didn’t take the chocolate because they were forced to; they took it because, hey! Free chocolate! The rewards were so attractive and the risk of being caught was so remote that half the town went on a three-day Wispa binge.