[RightWhale]

Is it because they are running out of cars to burn?

It is the nature of rabble to run out of enthusiasm fairly quickly. They all have work to do back at shantytown and staying out all night is cutting into productivity. They are getting tired, and very bored with this.

[Skinn_dogg]

The muslim “youths” are calling for an end to the French government’s(police) occupation of their neighborhoods.

[El Gato]

It is the nature of rabble to run out of enthusiasm fairly quickly.

I wouldn't call thirteen nights of arson, looting and general mayhem, "fairly quickly".