The schools are an extension of the government. Secularity should be enforced to an extent. To the extent where you're actually causing people to do things against their own beliefs, maybe it's not a good thing. Forcing everyone in school to eat pork or something, for example, that'd be borderline cruel. If it's some kind of horrible sin for someone not to wear a headscarf, then maybe kids shouldn't be forced not to wear them.

On the other hand religion is rather silly sometimes. HOW is it harmful for someone not to wear a headscarf? When this kind of thing comes up, I always think, what if I said my religion demands that I get every Wednesday off from school (and work), and I'm not allowed to eat or touch any form of cheese, and three times a day I have to run outside and jump up and down in place for 10 minutes? I'd be laughed at, most likely, and told to act like a normal human being. Change Wednesday to Saturday or Sunday, change cheese to pork, and change "jump up and down" to "get down and bow", and you end up with something out of today's mainstream religions. The silliness of it all probably isn't even apparent because everyone is used to it, but if you take a step back, I'm almost willing to say yes, ban the headscarves, and ban crosses and whatever other magical charms people want to wear to school.

I'm also in favor of school uniforms in general. Kids have 14 hours a day when they're not in school to be as individual as they want.