oooookay, you keep thinking that. The Chinese deployments haven't started a war because it's not in our best interest to start a war with China. I wouldn't count on us defending Taiwan, either, if they decide to invade. However, moving 20,000 troops or so towards their treasured claim on Taiwan might do the trick.
I love the cut-and-run mentality. You think we're in South Korea for the sake of South Korea?
"I wouldn't count on us defending Taiwan, either, if they decide to invade."
Then you are clueless regarding our policy re: Taiwan.
If Taiwan is attacked by China...we are there. You might want to do a google on the Taiwan Relations Act, the Three Communiques with China etc.