It's not about what Taiwan wants, it's about what's geopoligically expedient for America. Even since HW Bush, the higher ups of American intelligence have mocked the idea of "unleashing chiang" and attempting to retake the mainland.

The new framing of Taiwan is that it's a plucky "vibrant" democracy since the island was turned into a liberal democracy during the Clinton administration when the DPP, a party of local landed industrialists sympathetic to Japanese colonizers, became the second of two awful parties people can vote for. The recent strategy for the US has basically been to goad China into a costly and unwise military invasion by promoting Taiwanese independence movements.

I should note that Democracy in Taiwan was only introduced after all native resistance to the colonizers was wiped out and all leftists were executed, all with the encouragement of the USA. The current USA backed independence movement claims the struggle against the white terror as its own despite getting their orders from the same institutions that cosigned KMT dictatorship in the first place.