I think you can go back in history and look at what the effect in Asia and the world was of a divided, fractured China from, you know, the opium wars through the Chinese civil war, and I don't think it was pretty for Asia or the world.
As I've said many times and publicly, a war between China and Taiwan that involves the United States is a lose-lose-lose.
There are many causes of violent deaths in America - murders and traffic accidents - that we do not approach with the same 'no price too steep, no task too difficult' approach that we take toward al Qaeda.