Why is it that libertarians often resort to lame "parable-like" stories to get their point across? Is there really such a dearth of real, concrete examples from

Why is it that libertarians often resort to lame "parable-like" stories to get their point across? Is there really such a dearth of real, concrete examples from which to draw? It might be forgivable if the parables were at least interesting or original. But this one has been recycled on senior citizen mailing lists for at least a couple of years now. You can find it splattered all over the Internet wherever tea partiers like to distribute their propaganda.