While I 100% agree that "taxation is not theft" and I realize that they're necessary (and legal!) and I pay them....we're not really "free to leave at any time".
For one thing, the United States has a 30% expatriation tax. They will take 30% of your wealth just for leaving.
Your stuff (which was partially acquired via exploitation of the ecosystem that is the country that wants those taxes... Bet you drove on a public road) isn't.
Sure you can, you even get to keep 70% of the things you acquired while participating in the social contract! That's a pretty generous severance package.
For one thing, the United States has a 30% expatriation tax. They will take 30% of your wealth just for leaving.