Any kind of 'religious' or 'cultural' clothing or accessories can and often will become a problem to someone.
Should
that kid in Montreal be allowed to wear his
kirpan to school? There is a no knives policy surely. Canada's Supreme Court says it's ok.
That
Muslim English teacher in Britain who got suspended for refusing to take her full head veil around her male co-workers. Could not seeing your co-worker/teacher's face hamper things at the school in some manner?
In Canada, it's been ruled that
Sikh RCMP's (Police) can wear their turbins while on duty - rather than the traditional hat that everyone else on the force has to wear.
All tradition, be it secular or religious is sacred to someone. Some flex with the times, others stay stead-fast to their roots. Some unfortunately choose out of convenience when to exercise their religious traditions. Evidently the Muslim British school teacher had gone to her job interview with no veil. (That's what I read, be that accurate or not I know of countless times I've seen people play the religious - or race - card when it suits their purpose ATM)
Some places and groups allow for easier integration for the minority. Others, not so much. I've heard that in some places in the Mid-East it's a big no-no for (western) women to walk around in public wearing the traditional no-veil of their home country.
Me, I'm not predisposed to feel a certain way about religious fashion one way or another.
Case by case, based on safety, respect and common sense. We can't please everyone all the time.