Violence has broken out in Greece for the fourth day running. Hundreds of protesters threw stones and bottles at lines of riot police outside the Greek parliament in Athens. The anti-government clashes led to the police killing of a teenager. The victim is to be buried this afternoon. But the rioters’ anger has a more profound basis. Corruption scandals, a widening gap between the rich and the poor, and vehemently opposed social reforms have all served to provoke the outbreaks of violence.