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.

Hah. Who are we kidding? The starving people will just get together are start killing others.

If the critical mass is high, you get what's generally called a "revolution".

If the de facto government (whether public or private) really is as weak as many libertarians appear to want, then it'll be a pushover. End of Libertaria.

If the critical mass is too low, you get what's generally called a "high crime rate".

In either case, a thoroughly unpleasant and shitty situation to be in, for everyone involved.