Libertarianism is rampant here but it's due to demographics: geeks, (actual or wannabe) entrepreneurs, skewing young and male.

It kinda comes with the territory :-)

It's primarily due to the high net worth or high income of people here. Right-libertarian ideology is more than just a set of economic views, it's also a moral framework that places them at the top. It tells them they are intrinsically good for accruing as much wealth as possible. People seek out tribes that morally elevate themselves, and then retrofit made-up reasons.