It's a good question. My opinion as an American isn't definative, but I'll offer my viewpoint.

The primary reason most Americans would not care comes down to policy. There are thousands of things that we refuse to export to China, and adding a few computers to the list wouldn't raise any eyebrows. Both major political parties are strategically invested in Taiwan, so there is a bipartisan motivation to pass tough-on-China policies. It's definitely arbitrary, but not unwarranted; China invoked this through territorial aggression.

The rest of your examples would probably make even the least-patriotic Americans laugh. The right to self-determination is not an invitation to Maoist-Famine your entire population. There are humanitarian (as well as territorial and political) implications to a nation's actions, especially when it takes up arms against it citizens or defends a mistake of international concern. Very few remaining Americans share your anti-globalist mindset - tragically, the few who do are obsessed with American exceptionalism all the same.

I hope that could help. Words can't describe how nuanced the American national sentiment is, there are layers of secularism and faux-support that are overriden by completely different ideals. It's not much different from most places in the end though, I'd imagine.