France has a social classes problem. There is class segregation everywhere. If you are poor you live in a neighborhood where everyone is poor and since everyone is poor there isn’t enough money to invest in the neighborhood. So these neighborhoods are neglected. As a result many poor youths are unable to climb the social ladder and thus some will end up living a life of crime. And so it happens that many migrants who came to France and Western Europe as a whole were poor. Since Western Europe wanted cheap labor. Sweden has the same problems as France with their migrants. Since many cities in Sweden are also segregated along the classes.