What you say is true, and I agree on self-determination in the abstract. But I simply can't believe the U.S. is in Taiwan to defend its people, rather than contain and weaken mainland China. The U.S. has demonstrated time and again it will gladly throw an ally under the bus in order to weaken an adversary ("it may be dangerous to be America's enemy, but to be America's friend is fatal"). To go back to the OP, moving TSMC to the U.S. looks a lot like preparation for scorched earth in Taiwan. [1]

[1] https://asiatimes.com/2022/12/us-mulls-scorched-earth-strate...