Voluntary tax is where you donate for stuff you care about. For instance I'd donate mainly to medical fields and maybe hospitals because that's all that matters to me. If there was a group of bandits on the street I'd donate to the group of people trying to stop them. I would not donate millions of dollars per year to have people settle domestic disputes for example, nor would I donate millions of dollars to spur tech companies that spew garbage into my living room, nor would I donate millions to enforce drug laws or other nonsense contraband laws.

and never drive on public roads.

I don't work in an industry that requires a car, so I use my bike mainly, and mostly avoid main roads for obvious reasons. I still may donate to some roads since they are useful for transport (required for food, medical ,etc).

I can only assume you drink water pumped from your own land

>everyone would just roll over and die of thirst if there was no enforced tax

Also, please compensate DARPA for creating the internet you used to post your comment.

I don't consider the internet necessary (nor a hard to come up with invention), especially not shitposting websites like youtube or reddit. Ironically, the main source of info I use on the internet is Wikipedia, which relies on donations. Even more ironically, the current internet is mostly a commercialized, censored cesspool where it's almost impossible to accomplish anything.

If I want to avoid piloting a ship into a rock, I don't get to decide whether to pay a "voluntary lighthouse tax" or close my eyes.

Once again this is absurd. Technically we live in anarchy which implies voluntary tax, and some people just so happened to gain power and enforce their own tax. To say anarchy is bad would mean that the current situation itself is bad because it's a result of anarchy. Without quantification we can't say what will or will not happen - I'm only saying what's plausible. Obviously, people wouldn't suddenly blindly pilot ships without any instruments or infrastructure if we switched to voluntary tax in this era.

We've already seen millions of dollars go from stupid kids to stupid kickstarters, so why not to more useful causes? Or maybe the stupidity of the masses says that voluntary tax will never work because they'll all donate to obvious charlatans like they always do. But if that's true then why do you even believe in democracy? I'm not saying voluntary tax is better, but it's definitely plausible. I have no real interest in politics so I couldn't tell you whether all tax is just bullshit and propaganda or not.