The Chinese on the island look down their arrogant noses at the backwater indigenous Taiwanese. Their loyalty is to China, though they dislike communism.
It’s a clusterfrack.
So they will not have the passion to wage war against their neighbors just so that China can take over and institute communism, anymore than the American English ultimately were willing to wage war against their Scots-Irish and “redneck” countrymen just so the King can rule with an iron hand and preserve Mercantilist monopolies on trade. Maybe the Lees, Jeffersons and other aristocrats were socially arrogant, but they fought on the side of the rebel colonies. So long as America has Taiwan’s back, going over to the Chicoms becomes a dubious undertaking with little or no prospect of reward.