Given the disaster of the Hollande administration, the current weak state of LR, and the ongoing problems with the European Union, it's no surprise that the far-right has become quite powerful in France. I would caution against underestimating Le Pen.
This could be a real opportunity for Hollande. If he really orders the police to go in heavy and start cracking heads, he could have a 9/11-style rally effect and boost the center-left. But like most center-leftists, he is an idiot will probably do nothing and hand the country over to Le Pen.
French police are not American police. It would be hugely out-of-character for them to behave in such a fashion and violently crack down on rioters.
Are you joking or are you this unaware of French police?
I am aware of what French people have communicated to me about the French police. I could be terribly misinformed on this matter.