Try and tell a Libertarian that their dream world is utopian. About the best you can expect in return is some reference to "Atlas Shrugged".
I do agree with your comments.
This is not to say that there aren't extremist wingnuts would label themselves as libertarians. But anyone who holds that the libertarian philosophy must be realized in a Utopian fashion, that is through systematic destruction of the existing order, has obviously abandoned other key elements of the libertarian philosophy such as volunteerism and non coercion.