The tax rate was total revenue relative to GDP, so not just income tax. https://en.wikipedia.org/wiki/List_of_countries_by_tax_revenue_to_GDP_ratio

As a society, we need to have certain rules, and those rules need to be enforced. And no, it's not enough if when something happens, everybody in the town just runs to the guy to shoot him (as some libertarians actually propose), but we need an orderly process, with independent judges and all. And that process must inevitably include some police force, to enforce the rules.

If you can't see why we need a police, then I think you may be too far gone. If you can, we can talk about where the line should be.