Imagine you're in a room you can't get out of. By the nature of aerobic respiration, you're slowly transforming all the oxygen into carbon dioxide. Now imagine there is a running car in the room with you. Do you first shut off the car to prevent it from filling up the room with exhaust and carbon monoxide, or do you give up because there's no point in life?
You can either give up by selling all your belongings and begin to live on the street as a non-tax paying citizen, or you can do something to stop the things that are taking away your freedoms and liberties, or at the very least, do something to make it harder for those that want to take away your freedoms to do so.
I suffer from depression and have had times in life where suicide is a real option, yet I can't imagine how anyone can think "welp, I better give up now because there isn't a point in trying!" There's always an option. Exercise that option.
False dichotomy, there are other options that both don't lend any legitimacy to the state and allow you to live a pretty good life these days. Especially for people with technically advanced skillets. The world is much bigger than the tax farm you were born in which claims dominion over you, and outside the borders of that farm, its powers are greatly diminished.
 Obviously there are exemptions for foreign earned income, but if you're in country with lower tax than the US (of which there are a fair amount) you could end up paying the US taxes on money that has literally nothing to do with them. Worse, if you're married to a native of that country and must file jointly in the new country then the US expects you to file jointly with them too and pay taxes on your spouses earning.
Like what? (Last time I asked this question on HN I got about 5 answers that said "Call your Congressman," which I don't agree with.) I honestly don't believe there's anything I can do that would change things meaningfully, even if I dedicated my whole life to it, short of maybe starting a major political movement, which I highly doubt I'd be able to do.
Even simply refusing to join these organizations doesn't help as much as you might think. NSA can teach smart people to program if it comes to that, so there's always someone to fill the seat. Only now, the person filling that seat has ethical norms even farther away from yours.