It's a law about religious signs at school. France is a laïque country, you can have any religion you want, but school isn't the place to show it of.
It's not only the scarfs but any religious signs at school.
If you can't understand that it's the laïque system that keep us free, to have the religon i want, to think whatever i want to think, please Grunhertz stay where you are (and it seems obvious you won't visit us anytime soon)...