deadmeow wrote:First of all, anyone can donate to build roads. Second of all, if people share resources there is no reason to work 16 hour a day jobs. Third, government are cartels, warlords and occupiers.
People can contribute to infrastructure. But they won't. Basic game theory - to understand why it won't work, look at the Prisoner's Dilemma and the Tragedy of the Commons. Each individual benefits more if they don't pay into infrastructure - after all, their money won't make much difference, and they have lots of other things to spend it on. However, everyone will do this same cost-benefit calculation, and nobody will actually choose to pay in. Disaster. The same logic applies to a surprising number of fields - the military, for example, could not be funded by volunteers.
If you look at the math for the Tragedy of the Commons, it turns out that the best way to make everyone cooperate (pay for infrastructure) is to make the alternative worse. In other words, by enforcing taxation, the government changes the nature of the game. Dodging taxes is punished, so people pay into the system, and get their infrastructure. Taxation is accepted because, for all its inefficiencies, it gets things done. Things which we need, and which are to our long-term benefit, but which we could never accomplish in a vacuum.
I don't agree with you about the dominant model in an absence of government. You seem to be assuming that without government intervention, society defaults to something resembling "voluntary collectivism." To me it seems that a more likely option would be "predatory capitalism." Without regulation, it's easy for the wealthy and powerful to set up systems resembling slavery or serfdom. The government guarantees you a number of rights and protections that you've probably never thought about, but rely on every day.
I'm not bothering to contest your definitions about government. Let me just say our "formal" government is charged with serving the people (see: preamble of the Constitution). And while it's hardly perfect, we do our best to elect people who keep that mission in mind. Hardly the same as, say, a Colombian cartel - their explicit purpose is to benefit a group of elites at the expense of everyone else.