Why is libertarianism so infallible?

It is due to it being the application of political science. It does not permit failed policies to be continued fruitlessly year after year with idealistic fervour, it is next to impossible for anyone surrounded by fierce libertarian critics to continue clinging on to lies. It is a purely functional machine, lubricated with justice and fueled by free speech.

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Except you pay for other people's roads if yours doesn't need that much maintenance.

An alternative to car tax could be a license to drive on roads owned by certain road companies. That's another method of payment.