Unless you have a statistical survey of the bitcoin community, all we have is the anecdotal evidence. And the anecdotal evidence, both from my personal experience, as well as _objective sampling of the celebrities of the community_ is that libertarianism is disproportionately represented compared to the populace in general.

And since the early adopters and pioneers of a community often mirror the philosophy of their founders, it is highly probable that the bitcoin community is overrepresented with libertarians.

That this seems surprising to you or you're so defensive over it seems strange. It seems pretty self evident. As if you found a community of gun owners producing crypto-guns, and were shocked to find they were NRA members too.