There's a lot of convoluted debate. First thing that gets mentioned is immigration and then assimilation.
I've spent 6 months in France in total and my very basic level of French reflects that. I never stop noticing how everyone is absolutely kicking my ass in the French world when it comes to speaking French. If assimilation is learning French, I have failed as a Frenchie and all the northern and southern Africans and everyone has trumped me. Here in Italy I'm seeing Asians, sri Lankans, Hindus, etc, all speaking Italian beautifully. They look assimilated.
Race. Most victims of rioting in France are shopowners as the riots happen on the street between cops and rioters and the victims are shopowners. Shopowners are entrepreneurs and often black, northern African, whatever. We have entrepreneurs from all races.
Both the rioters and the victims (cops/entrepreneurs) speak better French than me. Actually normally cops would speak French as a first language and entrepreneurs perhaps as a second. Again, rioters all speak French well in general. All these people are more assimilated than me.
I live all over the world and never have troubles with law enforcement anywhere, easily obeying the laws. In my hometown I have issues with law enforcement but this is because they've been having issues with themselves for decades so their issues become my issues. Outside of Australia I never have issues with law enforcement and always obey the laws.
Rioters break the law. An unfortunate thing about left wing politics and the universities that underscore said politics is that they run on self medication with illicit drugs. Everyone on the right side of the law like shopkeepers and cops are considerably less likely to use illicit drugs. Universities spend untold hours running studies and papers on grand studies on everything except the illicit drugs professors and students and rioters are taking. Go ask a cop what drugs people are on maybe they can tell you. Magic mushrooms, LSD, marijuana, synthetic marijuana, ecstasy. Crystal meth. Etc. Drugs even mental health industry professionals and cops sometimes use recreationally. Drugs rioters will definitely be using. The jury is out on what all this self medication with illicit drugs is doing. Psychiatry ignores it all and just calls it borderline personality disorder.
Economics. Switzerland speaks French and I just popped in and out various times today by train and boat and didn't see any rioting because their economy is great. Why does Europe really need 50% tax rates? What's so great about tax and spend economics? Why not shoot for a 20% tax rate?
Cost of living due to oil pressures. You can't underestimate this but we periodically see the French revolting over stupid crazy shit like pension retirement age, etc, all the time. French people need someone to appeal to their humanity or they'll act the fool. This is their nature.
Plenty of people around Milan have money, can't see them rioting. They're too busy prancing around Como in their fancy clothes, not the types to riot.

