A socialist will claim that it is perfect socialism because of it's peer to peer existence.
Socialism is not a voluntary system just because it contains some of the same letters in the same order as "society". It requires state force to operate.
This is a common misconception. Not to get into some big argument or anything like that but Marx wrote about the "withering away of the state". I'm no socialist, but I'm just trying to be fair and claim that anyone of any political ideology can justify their use for bitcoin.
Another thing you would read from Marx is the big time "from each according to their ability, to each according to their need" quote. The bitcoin p2p network is exactly this, as are torrents. Each downloads and transacts as they please, and offer whatever bandwidth they can to help others transact.
Simply claiming that this is an invention for libertarians is a road to nowhere, seeing that not everyone is a libertarian.