Whether they can or not is highly questionable. "Few will really care" is certainly false. And in terms of nation states caring, that's also incorrect because

Whether they can or not is highly questionable. "Few will really care" is certainly false. And in terms of nation states caring, that's also incorrect because Taiwan is a linchpin of US Pacific foreign policy and for the US to do nothing or "not care" about Taiwan being invaded would signal to allies in the region that they cannot count on the United States and that they should find their own defense arrangements. It would de facto kick the US out of the Pacific and end global hegemony overnight. Frankly, Taiwan is a big fucking deal w.r.t US, Japanese, and Australian national defense concerns and is a big deal to other nations such as New Zealand.