By the way, what you talk about that German book describing, the exact same situation obtains in France. There, it is largely North African Arab communities and sub-Sarahan African communities, which often but not always have Islam in common. That, plus the same failure of assimilationist policies, plus the unfortunately very real fact of radical Islamist terrorism within France itself, has led to a kind of pervasive Islamophobia among the secular and Catholic populations that is not quite mainstream, but does feel like a background hum to me whenever I watch French TV.