I have read a lot of libertarian science fiction through the years and in them the individual often seems to have very little actual freedom. It's instead the group that the individual belongs to - struggling against it at some point, at but eventually being reconciled and becoming one of it's leaders - that (theoretically) has the freedom.

The individual is tightly tied to specific roles as a member of the group - who often are family or clan based. The group itself is also tied to it's founding idea and role, not wanting to change it, so it's own freedom is also very much illusory one.

In it's core, it's very much Plato's utopia once more, not about liberty, but creating a supposedly perfect society and then "protecting" it from change. No liberty for libertarians in their own visions.