Look at the list of people who developed the atom and hydrogen bombs for the United States. They were overwhelmingly foreign-born.
Imagine you moved to another country at age 22, studied there, got married there, raised kids there, and built your career there over the course of 20-30 years. You would not simply "leave at any moment."
Many of them were from countries that were at war with the United States, like Germany and Italy.
George Gamow, one of the most important American physicists ever, was born in Russia, educated in the USSR and began his career there, before defecting to the US. He didn't work on the Manhattan Project, but he did consult on other military projects during WWII. There are lots of other examples of Soviet-American physicists, including one of the inventors of quark theory (George Zweig) and the one of the people who formulated perhaps the most famous paradox in quantum mechanics (Boris Podolsky).
> Surely this is something to think about before creating a caste of foreign high skilled workers and academics?
Casting suspicion on students and scientists in the United States because they come from "enemy" countries is not a healthy thing for society to do. I also object to your use of the word "caste." Castes are hereditary groups with defined roles in society. What we're talking about here are simply smart people who did well in school, and managed to get into top universities.
I call it a caste deliberately for those reasons. It is hereditary I believe whether through socioeconomic status or genetics or culture or legacy status. It's already becoming apparent. There may or may not be social consequences. I fear there will be.
Most of the foreign-born STEM graduates I've come across in the US are not from a hereditary caste. I'd even say most of them are from the first generation in their families to obtain such a high level of education.
Legacy is something very different. It pertains mostly to undergraduate admissions at elite universities, and almost by definition, foreign-born students are not the main beneficiaries.
Some of my favorite people I know are foreign stem grads. But I have also met some who have nothing but contempt for uneducated americans. To tie this to my original post I do wonder if this is not only a security risk but a cultural risk which creates a mostly foreign immigrant group with high caste status in the US that is hereditary/permanent based on university admissions policies. There is lowered expectations for non immigrants.
The most provable issue is the security issue though not the cultural issue. A thought experiment: would France or Japan or China accept that their most elite people are heavily foreign? Probably not. One can imagine why this might be an issue. Professors with dual citizenship can leave at any moment and during a war that could devastate us. What real loyalty do they have?
My remedy is to nationalize an effort to focus less on tiktok dances, followers, and selling foot pics and more on education. It's what other countries are doing and I am afraid if the US doesn't react it is heading towards decay.