France: Cultural Maginot Line.

France is sitting behind a cultural Maginot Line.
Maginot Line wikipedia In fact, it did exactly what it was intended to do, sealing off a section of France, and forcing an aggressor around it (and the few forts of the Maginot line which were directly attacked by German armoured troops held very well). So the rioting youths, like the Germans, are going around the defences of France.
French rioting spreads to new cities Reuters
Rioting by youths, many of whom are Muslims of North African or black African origin, has partly been stoked by their frustration at high unemployment and the perception they lack economic opportunities.
The original Maginot Line stopped the Nazis, but only in one area, there was a gap through which the Nazis gained their victory. What is the gap this time? Multiculturalism? No one culture to hold the nation together.