Another important factor that has been overlooked is that the US-China relations are terrible, they are even speaking of world war 3 these days! Why would Chinese miners migrate to US in this situation when there are closer countries some of which are China's allies.
Good point! Still, it's important to always make a distinction between the people and the governments. The relationships between those in power are bad, but unfortunately, it's the little guy who suffers the consequences. Those appointed to make decisions impose sanctions that don't affect them that much.
The averagely intelligent and educated American don't see the Chinese people as their enemies, and vice versa. Negative thoughts are born when your existence and job security is threatened. Based on recent events, Chinese miners can't and shouldn't have positive things to say about the actions of their government.