You're splitting hairs and failing to see the overarching point. The specific races or religions don't matter, the key commonality is that they are from an inferior outside culture and shouldn't have been brought here in the first place. This erodes societal cohesion and trust, for exactly the reason you see demonstrated here. Not all cultures are equal, and bringing in people from "kill or be killed" cultures tends to ruin the "trust in your fellow man" cultures. Maybe crack a history book and look at how our relatively peaceful society came into being, and you might have a bit better perspective on things.