J Yes, most of us use roads, bridges, the military, and other government-created infrastructure and institutions -- but we all use these things to a different extent and it is impossible to quantify how much of this or that service each person uses.
.... which is why taxes are set on the basis of political discussion informed by what numbers we have available. It is precisely because no one has numbers, but everyone has an intuitive feel, and the political process achieves a compromise that everyone except for Libertarian theologians generally accepts as "fair."
For example, I have no children. I argue, therefore, that I shoudln't have to pay to educate other people's children. Someone else points out that an educated public is still a benefit to me; I personally have newspapers to read only because other people's children are educated (if I were the only literate person in my county, there would be no newspapers at all).
Okay, yeah, that's a point, I admit that. But I shouldn't have to pay as much money as someone with four kids to educate.
Yeah, they'll accept that. How about we do school taxation on the basis of the size of the property you occupy, then? Someone will a lot of kids will live in a large house --- you live in a relatively smaller one, so you will pay less. Reasonable?
Yeah, but I'm wealthy -- so I live in a large house anyway. Why should I pay more just because I make more money than a Wal-Mart clerk?
Well, you derive more benefit from public education than she does.
What do you mean?
How often does
she read the newspaper?
Oh. Good point. Okay, we'll fund education through property tax, not through a direct income tax.
And thus the property tax rate is set to cover education. Or not, depending upon what the local discussion ends up being.
But the idea that something isn't fair just because it was arrived at through a compromise that all parties involved accepted is.... well, there's no other word for it. That idea is
stupid.