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.

Doesn't matter if libertarianism "fails" to help poor people. In the end, no one person has the inherent authority to force me to do something against my will.

Democracy is two wolves and a lamb voting on what to eat for dinner.
Freedom is a well armed lamb contesting the vote.