> I'm not so sure the country could hold together in the event of an attack
I'm not American, but if anything I would think that nothing would unify the US like the threat of an external invader. I have a hard time thinking people would care about who's democrat or who's republican if a foreign nation is dropping paratroopers in your neighborhood.
> There's a reasonable chance that Americans will use the opportunity to destroy the government from within.
I seriously doubt it. Even the most fervent, gun-loving, militant libertarians realize that sabotaging your own government during a war is not in your self interest.
> I support Taiwanese independence, but I'm not sure I support it with my life.
If the US declares war, it doesn't really matter. It's not like the US involvement in WW2 or Vietnam was put to a referendum, if your country is at war, you are at war, unless you have enough money to flee the country: but realistically a war between China in the US would be a world war, or at the very least (best case) a Nato - China war, which is why it's _extremely_ unlikely to happen. Neither the US nor China has anything to gain from an all out war. And even if China is a formidable opponent, it would certainly tank their entire economy.