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.

Socialism means the government does things first and foremost for the people. Sometimes this damages the economy, that is, the rich-man's economy. Working people are net beneficiaries. In a democratic system, socialism should be the common-sense result of political decision-making. However, in the USA, socialism is little understood by the population and is the subject of massive corporate propaganda, seeking to convince people that if the government passes laws and adjusts budgets to benefit working people, it will HURT rather than HELP them. That so many people fall for this propaganda is a fine testament to the power of the joint corporate-state propaganda system in the US.