the problem with your analogy is that China propping up Cuba is very different from the present American relationship with Taiwan. In your scenario, Cuba would actually be dependent on China economically. Taiwan certainly doesn't need the US to prop up its economy. What the TI folks want is wider international recognition, which we are not help them with. It is actually not in our interest to help Taiwan to gain wider international acceptance, because that would lessen their dependence on us and lessen our already limited influence. It is pretty clear that our influence in Taiwan is very limited. We can't get the DPP to shut up and we can't get the KMT to support the arms deal. And we are not supporting Taiwanese independence, not just because we don't want to piss off PRC, but because a truly independent Taiwan would be free to form diplomatic relationship with any country, buy arms from anybody, and less useful for our purpose.