Alright, so this is my opinion on the issue, though I don't know much about it. I'm going to speak as abstractly as possible so I don't run the risk of contradicting facts.
You may think you are liberating someone by banning their traditional icons, but in doing so, you remove an option. Free will is only fueled and strengthened by the breadth of options you are given. You know certain cultures are shaped to prefer certain options, just as most of the western world prefers to be 'liberated' by not wearing burqas, and fundamental Muslims prefer to have the option of wearing burqas. So I say that society should make an allowance for options that are only ethical and produce the greatest benefit, while preventing the greatest harm.
If you would, imagine someone imposing one of these "walking coffins" on you. Does it feel good? Does it feel alien? That same alienating, writhing feeling you get is the same feeling Muslims extremists get when they feel your culture being imposed on them, or when they are stripped of their own.
This feeling only stokes the tension on the Muslim side. What does that do? It may make some sects more violent or radical. It gives them ammunition.
But it's France's call. It reflects on the Western World, though, which is a concern.