I don't think it ever crosses these people's minds that some other country PAID FOR these people's education and they are now USING that education elsewhere for the profit of a foreign nation.

All my high school and college education was at free schools/colleges in my home country, paid for by taxpayer money. All incredibly competitive places, with very high maintenance costs compared to the other colleges around, not a single US dollar was invested in me and here I am paying taxes and improving this place.

The bargain the US gets from this is one of the biggest reasons it can do what it does, the investments it makes are compounded by the work of the people that it never put a dime for.