If you werent thinking that, i think youve missed the point of the post and national security concerns. Its not always wilking. Chinese stidents overseas are tasked with spying on host countriea and do so out of fear ofntheir families. Literal spies from russia had infiltrated the NRA (and the presidency of course). Israelis spies travel under irish passports.

Of course, not all foreign nationals are spies, but when countries are in conflict, it creates natural suspicion. Some is justified, some is not. How to tell the difference is the question.