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I would not call the german pirate party a "libertarian" party. Many of them support the idea of an unconditional basic income, which in my opinion is rather socialist.
I don't think that real "libertarian" parties do exist in germany, at least not to the extent described in this thread.
The pirate party does have some "real libertarian" members, but most of them are leftists.
"Real libertarianism" is an extreme minority view in Europe, and that's why they will never have their own party.
The word "libertarian" doesn't even exist in the German vocabulary. There is only "liberal", which is used by moderate pro-market parties, and "freiheitlich" (literally: freedomist), a term which used to mean something like libertarian, but has now been hijacked by nationalist/populist parties on the authoritarian end of the spectrum.