The fact that hardcore Libertarians tend to be pro-contract slavery, pro weird pedophilia views and against environmental protection.

Wow that's a.. idk weird stance, I've never seen this being advocated by Libertarians.

I believe libertarians are the most rational people. 'Geolibertarians' are the pinnacle of rationality IMO, because they understand scarce essential resources (like land, but also applied to minerals, etc) are subject to inefficient monopolistic dynamics, and thus should be somehow regulated for the common good.

Libertarianism is inherently flawed and lead to a kind of facism or contract feudalism

Yeah, kinda of? That's why I support geolibertarianism. But I don't think pure Libertarianism is all that bad you make it out to be. It's an incredibly rational way of thinking that maximizes freedom and productivity, and works very well when society has abundant resources. Libertarianism was the prevailant (albeit imperfect) mode of government for the US until the first World War.

Geolibertarianism is a good solution for when free-market meets limited resources. I'd say that's also probably the most favorite model of government that Milton Friedman would have