Who are the chief victims of neo-Nazi violence in German, pray tell?
If he was a neo-Nazi, the odds are very poor that he was mad at moslems. Most neo-Nazis support the moslems 100%. Why the 9/11 tattoo then? Either to celebrate or because he believed "the Jews did it."
Who are the chief victims of neo-Nazi violence in German, pray tell?
I assume you meant "in Germany."
If the group/individual is actually neo-Nazi, then its target is always Jews. German Nazis have always been pro-Arab and other "far right" European organizations (such as France's National Front) are also pro-Arab/islam. Just as with David Duke in Tehran, real Nazis will always make common cause with the enemies of Jews no matter who they are.
If you're referring to boorish nativists, every country on the face of the earth has people like that. But if they're Nazis and not just common ordinary nativist thugs they will support the Arab/moslem world against Israel and Jews.
Also, one would expect any real Nazi worth his salt would recognize Punjabi-speaking Sikhs as his fellow "aryans."