At least for now people haven't at large elected politicians who would eliminate taxes.

Consider that lots of people regularly and voluntarily give a certain percentage of their income to their religious institution, without any kind of enforcement structure. There is a belief that such practices are good, right, and required. And it must be a strong belief, because people do love their money.

Second, taxes are not a gift or donation, nor is the government just taking them from you. They are payment for services. It's true that you are locked into a business transaction with the government, but it's meant to be a fair exchange. And unless you are incredibly wealthy, you have a favorable rate in the sense that the services you receive are worth more than what you're paying for.

People like roads and parks, actually.

Of course nobody would pay, because then the government would be exposed to the free rider problem just as badly as every organization that’s not a government is. That’s not a sign that people don’t want to pay taxes if everyone is also (having to) pay taxes. It’s a coordination problem.

If that were true no one would ever round up to save puppies at the grocery store. Yet people do. They throw money in the tithe at church and into the musicians instrument case and into the panhandlers cup. Not everyone does of course but enough people do where these things happen every day.