Hello, Kev,
I'm not sure what you are looking for, but I'll add a couple of comments based on my experience with immigrant engineers and scientists. My PhD is from the Univ of Illinois, and a Bachelor's degree from Indiana University. Both schools had a large number of foreign students in the STEM subjects. They did well, having come with solid training from their home countries, but also had the adreneline to do well in the US. I've had over 35 years of experience in industrial R&D, and have found that immigrants work hard and well. They certainly contribute a lot to the innovation economy in the US.
Higher wages in the US are another appeal, but countries such as China are targeting these workers with attractive offers to move back to their home countries. Guarantees of good salaries and covered relocation expenses make relocation attractive.
The US should welcome all immigrants who want to contribute. I generally agree with your points about a strong government, open society, and standrd of living being atteactive draws for people. Those advantages have been eroded over the past decade, however. It makes less difference where they were trained, than what motivations they bring.
Bob