I'm not sure I understand the argument of the article. Yes my graduate classes have many Chinese students in them, but why exactly is it bad that they are furthering their education and doing research in the US? The biggest issue I see is that many of them want to live and work in the US after graduation, but basically have to leave it up to luck in the visa lottery system.
The FBI is not warning about students, but about government agents posing ad students, I.E. "operatives". Here, they have access to learn and potentially influence our culture from within. Most importantly, if the FBI is correct and they exist, they most likely do not have your interests in mind. That said, I don't know how one would deal with this without causing McCarthy style hysteria and sweeping up innocent stud…
What is the distinction here?
I do not generally expect international students on a student visa, with no intention of becoming citizens, to forget about the interests of their home country and prioritize the interests of the country they're visiting. They're here because the school is good, that's it.