IMO the government shouldn't tell people what they can wear, however its the government's obligation to restrict who can enter the country in the first place.
Why did they ever let these fuckers in in the first place?
I do not believe their culture is at all compatible with western culture.
From another point of view, how can the arsehole countries they came from ever imnprove if a "brain drain" of more educated people flow from them. They should do everyone a favour and stay where they are and improve their own country.