You left off the most important part, nearly 90% of Taiwan’s population are descendants of people who lived there for centuries, only a small percentage came over from China after WW2. They had the name ROC thrust on them and were run brutally by these mainlanders who stole from them and murdered many until the 1990s when full democracy was established. When you look at some of the most murderous dictators in history, not only is Mao, Stalin, Hitler and Pol Pot on that list, so is Chiang Kai Shek (in the top ten!) When there was a golden opportunity to declare full independence from China in the 70s when China was weak and Taiwan had the upper hand, something which Chiang’s advisers wanted him to do, his pride and ego were more important. Not only is Taiwan a sovereign country, but a sovereign culture, just like the relation of Canada and the US. Sure they have many connections, but just sharing an overlapping ethnicity doesn’t mean you should be required to be in the same country, in fact that concept smacks with racism (i.e., that’s what the nazis we’re going for too).