After PSG’s victory: why the violence?

Causeur sees immigration as the sole cause of the riots:

“Such scenes are repeated after football matches, on national holidays, on New Year’s Eve, or on any occasion, however minor, that brings large crowds together. They’ve become a social phenomenon in their own right. … Mass immigration has encouraged the emergence of areas where different norms prevail. … The night following PSG’s victory was therefore not merely a night of rioting, but also a demonstration – of the fact that no society can survive for long if those who reject the common rules are more determined than those responsible for upholding them.”