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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National means publicly funded through taxes yes?
And what about the injustice of poor people not having roads since their demand is not enough to warrant building nor fixing roads for them? National roads too? If so, then i think i spotted a trend in libertarian thought.