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 are many governent agencies we are better off giving up for lower taxes.

Name one that
 1: doesn't already take such a small amount of money that it's irrelevant in the big picture to begin with, and
 2: wouldn't reduce America to a 3rd world hell-hole by getting rid of it (without relying on libertarianism's magical "market forces" nonsense).