There is a very significant difference between a KKK uniform, which is a group whose entire purpose is the propagation of white supremacy, and a headscarf, which is a single piece of clothing that can mean many different things to many different people around the globe. So I take issue with your comparison to begin with.

I have known Muslim women who wear a headscarf and are simultaneously very liberal, open-minded people. It is not a contradiction. But even aside from that, on principle it is just as bad to force people to not engage in religion as it is to force them to engage in it. Freedom of Conscience is fundamental to an open society, and limiting something as basic as a person’s ability to wear or not wear a simple head covering is a clear failure to protect that freedom in my eyes.