What would you prefer to have in your city: a terrorist attack or revolts in the outskirts? The inhabitants of London would vote for revolts, undoubtedly. However, the terrorists that hit London can be counted on the fingers of one hand whereas the number of rebels is unknown and there are good reasons to believe that the French have bigger problems.
Nicolas Sarkozy, the ambitious French Minister of the Interior described the rebels as “bandits” and “the rabble” promising he would “clean” the violent zones. Such words were condemned by the Left but the Right blames immigration. However, immigration is not the problem (which is too weak in France, as well as the admittance of political refugees) but the integration of the populations that came to France several decades ago.
Those ex-immigrants do not integrate and they find themselves crammed into ghettos. Their level of unemployment is quite high as well as their arrests. In the United States, immigrants are more integrated and they benefit from the economic opportunities of the free market. In France, we don’t care too much about integration whereas in the United States, men like Samuel Huntington are alarmed by the integration of Latin Americans. But it’s obvious that Muslim populations are difficult to integrate. The disintegration flames do not burn in the United States but in Nicolas Sarkozy’s France.

Source
Los Angeles Times (United States)
La Vanguardia (Spain)

The fires of disintegration”, by Niall Ferguson, Los Angeles Times, November 7, 2005.
París se desintegra” , La Vanguardia, November 9, 2005.