You haven't lived until you've heard their hare-brained scheme of substituting law for some 'Shun List.' If you don't like the fact that your neighbor is having marital relations with a horse, then lo! just add him to the bestial shun list, and that'll teach him how much you despise his being cruel to himself or to others! Of course we'd all have to check the shun list whenever we meet or deal with any individual. And of course there's never an explanation on who will maintain the shun list or how much of a bribe it would take to add or remove someone.
In short, libertarianism is an ideology, and we have seen the terrible results over the past 40 years whenever these ideology-oriented people get into power. Their religion is their ideology. They see the world colored by the glasses of their ideology and hence they do not see Reality, and hence all their schemes are doomed to failure and we all have to suffer as a result.