While it has not garnered much attention, not only has China passed legislation threatening Taiwan, but they have also threatened Australia that it will take economic and worse actions against them if they support the US position on Taiwan. A lot of people do not realize how much of a economic threat that China poses. About 20% of Australia's economy is dependent on China. China has controlling interest in several sole source resources in Canada and other nations. They are making ovations to Venezuela to be sole receiver of oil from them.
If China attacks Taiwan, we may not have the manpower left to intercede. They may have enough economic muscle to cause us to suffer the most in a trade war. And if we let anything happen to Taiwan, how are we going to stop the threats agains South Korea and Japan? They could enforce an economic boycott that could devastate us.