Olivier Roy writes in The New York Times:
The rioting in Paris and other French cities has led to a lot of interpretations and comments, most of them irrelevant. Many see the violence as religiously motivated, the inevitable result of unchecked immigration from Muslim countries; for others the rioters are simply acting out of vengeance at being denied their cultural heritage or a fair share in French society. But the reality is that there is nothing particularly Muslim, or even French, about the violence. Rather, we are witnessing the temporary rising up of one small part of a Western underclass culture that reaches from Paris to London to Los Angeles and beyond.
... we are dealing here with problems found by any culture in which inequities and cultural differences come in conflict with high ideals. Americans, for their part, should take little pleasure in France's agony - the struggle to integrate an angry underclass is one shared across the Western world.