One China, or Not
So why this most recent entry in the pissing contest that is seemingly between the US (and Japan, and large portions of the west, and oh yeah, Taiwan), and China? The same driving reason it has always been. Domestic consumption. When the Communists took over and fully displaced their rivals in '49 they had to have some way of getting everyone if not on the same page, then at least reading from the same book. Having so familiar a bogeyman just beyond a ribbon of water served them well. Over more recent years they've added the specter of American corruption to the purity of life they've instructed their people that they have. Taiwan, serves as an adroit stalking horse for the leadership of China, and as long as they have wit to do no more than make urgent, and seeming earnest rumbling at and about the evils without their borders, it can almost certainly continue to do so for years to come.