It has everything to do with that. Even if one could justify racism, it's not very pleasant for the target. Ones first taste of Winterhold is racial tension. Between how brutal Tamriel is inherently, and how the Nords treat Dunmer and Argonian citizens, why should they care if some Nord woman dies? As for being parasites, you must be joking. Take a walk in the Grey Quarter. Get a pint at the Corner Club. Buy an axe at Sadri's shop. If those didn't benefit you at all, then you can call them parasites. They have business there, and only the Nine know why, but they seem willing to deal with any citizen.