I'm curious (1) how much of these people's education or experience was subsidized by the American economy and (2) how common the same situation is in China (i.e. US expats training up in China and taking that expertise back to the US).
If (1) and (2) aren't aligned, it could be one of the factors contributing to the growing sense that we pour a bunch of money into higher-ed without seeing much return.
I don't mean this from a US nationalist or political perspective - I'm merely speculating on the economics. Are the incentives for coming to the country aligned for both the person and the country? Many companies will pay for employees to go to grad-school but demand repayment if the employee isn't still with the company N years later. Would such a system for college/work visas make any sense to help keep talent?