I think the problem is more multi-cultural than multi-racial. But when it's a rapidly changing demographic driven by swarms of immigrants from other cultures who haven't the slightest intention or desire to assimilate, it's hard to separate the two. And also much harder for the small percentage of the immigrants who actually DO want to assimilate to do so successfully -- when 95% of the ethnic Arab immigrants are uncivilized non-assimilating Muslims, if you're one of the 5% who is fundamentally civilized and eager to assimilate, you're pretty much screwed because everybody's wary of people who look like you on account of the activities and attitudes of the 95%.
More Arab tribalism. Western Europeans as well as Americans think by letting these "good people" come to the west shows how compassionate we are. The Arab/Islamic mind views the endless freebies they get as a weakness by their hosts and despise the westerners. We are viewed as weak and easy pickings for conquest.