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.

Communism is the application of science to economics. It's science, it's all based on scientific grounds. All political philosophers consider it fundamental and foundational on scientific principles. It's scientific.

Shut up. Libertarianism is no more different than Conservatism or Liberalism. They are tried and true doctrines of politics and neither of them should profess some "scientific advantage" because saying such things is only illusory.

Libertarianism would never work. We have seen it in the early 20th Century when the rich and the poor were the only classes.

It took FDR and his New Deal to create a vibrant Middle Class.