What happened last time, and I think is happening this time, is that the French middle class Gallic youth come out to demonstrate about the new work laws, and the "youth" from countries other than France, ahem, get involved, attack them and steal their cell phones, ect. Thugs preying on fools, in other words. Police take the brunt of it, they probably all are being driven into the arms of Le Pen. And I don't blame them.
The guy on Fox seemed to think that Le pen would be the worst outcome possible.