Every action has an equal and opposite reaction. Or more easily put, when Muslim extremists form squads of "Shariah police" in German cities to enforce Shariah, or when Sunnis and Shia's, kurds and ISIS supporters bring their sectarian and political wars into the streets of German cities and elsewhere in Europe, then they will not only feed right wing sentiments but also justify what you call "racism", "xenophobia", etc...
Every action has an equal and opposite reaction. Germans, and European as a whole are very intelligent, very tolerant, and respectful people. Its the pathetic immigrants who abuse the hospitality of their European hosts who are responsible for the growing xenophobia.