"Taxation is theft"
I know. You did not say this. Someone else said this.
Okay, I've lived outside the city limits, in an area where road maintenance happened if someone with construction equipment had a day off and the desire. Those of us without such equipment figured out that they were more motivated if we stopped and gave them a little money for their gas, their time, and the wear and tear on their equipment. So, yes, it was voluntary, but it was still taxation. If one did not pay up, there was the nagging possibility that they would pay in the form of automobile repairs.
You know what? I'd rather pay a fixed amount and know that the road is going to be repaired in a timely manner by people that know how to repair roads.
There are plenty of things that I wish the government (at least at the federal level) would stay out of, but there are also plenty of things that I want them to continue doing. Some of those I'd like them to do less, some of them I'd prefer if they did more, but overall, I want them to continue.
For each of those things that they do, the ability to do it comes from taxation.