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.

There's nothing wrong with libertarianism. It's the libertarians who suck.
They're incapable of cooperation and refuse to do anything that requires more work than spamming internet boards.
Your typical libertarian (I'm talking about all kinds of anti-authoritarians here which includes the various forms of anarchism) is first and foremost an introvert.
The different views on economy result from their personal opinions on what's the best way to be left alone.
Far left wants to be mothered by the government and far right wants a solitary working environment.