Well Islam has the wrong face... If they can't make the effort to look a little less foreign, they're really begging for it...
That's what it comes down to around here -France- anyway. We managed to somewhat lock down the anti-arab sentiment during the 80ies, stabilizing it, but since the mid-90ies it came back under the guise of religion. Which, coming from a proudly secular country, is seriously fucking precious. Of course, now every religious movement is trying to preemptively defend itself by attacking everything in sight, and that secular, church-out-of-the-state statu quo is crumbling down. Suddenly we're a traditionally christian nation, out of fucking nowhere. We spent centuries trying to keep the churches in their place, but all it took was a bit of creative racism. And the lower classes ripping each other over who the good guys are, because that always ends well.