You could renounce your citizenship, but you may well be anticipating getting some income such as social security or maybe you are receiving some other pension, which makes it a BIGGER trade off to renounce.

I am not saying that I agree with world-wide income taxation, and surely there are trade-offs with any system whether we are referring to taxation or other matters of figuring out if you get benefits or will get benefits in the future.   Sure, you likely subscribe to one of those libertarian views, and you have already admitted to it, and sure I have issues with libertarians trying to spin matters with out accounting for how to deal with various public goods, but you surely did not start your propounding of libertarian ideas in your teenage years, so you have some issues with your having had made too many USA connections in terms of either prior employment or your desires to return to the USA or to travel around the world with a USA passport causing you to be unwilling to renounce your citizenship.. because it will likely cost you more than what you are willing to admit to because you want to spin the taxation matter in one direction (sure we all have concerns about taxation how their spent and from whom they are collected).