My solution?
Send them all back to Turkey or wherever they come from. If they don't want any part in German society, what are they doing there? They are coming to Germany, so they should behave as a German expects them to. That means obeying cultural rules and speaking the language. Don't want to do that? In that case you have no business there.
And yes, I think a true German looks like this blond-hair-blue-eyes ideal. Not necessarily blond hair or blue eyes, but most certainly Germanic facial characteristics.
Which by the way doesn't mean there is one kind of German. Germans from the south look different from their northern compatriots.
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