Well said. The US also has a huge number of immigrants. The major difference between the US and France is that those immigrants can easily find work in the US. And work is probably the most powerful method of assimilation (you have to speak English, dress like Americans, and follow the laws of Americans).
Another issue with France is that many of the rioters are not immigrants--they were born in France to immigrants. Again, many of them are not working and are therefore not assimilated. Of course, the problem gets worse over time. Who wants to hire an unassimilated punk with no real skills and who throws temper tantrums by burning cars? But again, he will always be a punk until he gets a job and learns responsibility.
As usual, socialism and social engineering create problems of which their designers have never thought.
This is why the US became the first multicultural society without giving up culture. A model we Euros for sure can learn of.
I agree. The main problem in France is unemployment. It's already very difficult for a native-french young people with high diploms or a good formation to find a job (the unemployment rate of the youth in France is the highest in Europe). So for an immigrant children, with no diploms, living in a 'no-go zone' and almost unable to speak french without an horrible banlieue's accent and a very limit vocabulary (except for insults), I let you imagine the difficulty. And without a job, no integration possible.
As long the employment market in France will be so rigid, there will be for these youth only two alternatives : criminality and/or islamism.