"They might associate with the undocumented, therefore shouldn't be allowed to do normal things" was completely reductive.

Looking at El Paso, since it was the first city mentioned in the article, the entire city is about 25% immigrants (>200,000 people). And of that, more that 75% is here legally. So, 150,000 give or take, that according to your first comment, shouldn't be allowed to do business because there are illegals nearby?