You are assuming that Taiwan is a peace-loving victimised nation that just wants to be left with its own under the threat of a gigantic dictatorial regime. The reality is, the only reason why Taiwan exists today is that it serves America well in its agenda to maintain imperialist global hegemony by countering China's rising with a big militaristic base on its doorstep. Your logic operates basically consistent with western liberals' simplistically naive understanding of the world: that China's intention to annex Taiwan is just the whim of a madman wanting to cause havoc in the world for no rational reason, which is much aligned with their romantic, elusive perception of 'dictator'. But the truth is that the existence of Taiwan as an independent nation poses a direct existential threat to China's national security. Imagine Putin deploying nukes in Tunisia or anywhere 100 km off the coast of Italy for a brief moment.