That comes with the territory of have the vast majority of the top universities in the world. One of the things that has kept the US as the global hegemon for the last 100 years is the fact that every other country sends their best and brightest to study here, and a significant fraction of those people stay here to work.

I agree the US could do more to take advantage of its position to benefit the average American, but torching exactly what put the country in that position is short-sighted at best, categorically stupid at worst.