well.. so it's not about "muslim women in hijab".. it's about covering/hiding your identity..the title of the thread is misleading and might cause the religious debates again. As a sample see thalib01's post.
This issue has nothing to do with the religion in general and muslims in particular. It is a security matter and you cannot blame them, it’s pretty much understandable.

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“You become responsible forever for what you have tamed”. Antoine de Saint-Exupéry