In theory, public political protest is a sign of a healthy democracy. But John Thompson, who has been conducting a life-long anthropological study of Man the Demonstrator, has some doubts. His research suggests the “protest movement” is politically unbalanced – conservatives almost never do it – and often unconnected to anything the public actually cares about. It seems to be dominated by semi-professional mayhem-makers who know little and care less about their cause de jour, as long as they make the news. But at least, writes Thompson, it is a reliable source of amusement.