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Of course it is understandable that they would fear a backlash. I can also understand why Chinese, Japanese or other Asians would fear a backlash, just for looking "Asian" (the killer in the news spent a lot of time labeled as just "Asian").
After 9/11 there were attacks against Muslims, and I remember at least one Sikh who was shot and killed at a gas station, just because he is Sikh and wears a turban. (Sikhism being an entirely different religion than Islam, and, if anything, often themselves actually have racist attitudes towards Muslims).
Having said this-I think that maybe the safest place might actually be on campus and not nearby at a random gas station.