Create a hostile environment for Chinese students so that they are encouraged to return home.
Then prevent them from coming at all because they may return home.
This completely ignored that the massive majority of Chinese stay in the US, and even more would stay in the US contributing disproportionately more than nearly every other grouping of people.
If it wasn't for the US driving them away, it's hard to see why any Chinese national, especially a well educated one, would ever choose to leave the US for China.
This would be an utterly disasterous policy. The only reason to enact it is if your own side is actively seeking war.
And may I note that irrespective of the overall behaviour of the two regimes, in the case of complaining about China causing problems for US interests in the China sea, the China sea is a lot nearer to China than it is to the US.
Trade routes over for one. Freedom of navigation is another reason. What they might go after next time is another concern. Like it or not, USA has interests and allies over there.
Frankly, I don't think we should educate anyone that goes back to a hostile country. China is rising, and that can cause a lot of problems for us, see China Sea for one. https://www.cnbc.com/2019/06/03/china-army-colonel-says-beij...