>>Libertarianism secretly relies on most individuals being prosocial enough to tip at a restaurant they won't ever visit again. An economy of genuinely selfish human-level agents would implode. Similarly, Science relies on most scientists not committing sins so egregious that they can't rationalize them away.<<

Libertarianism rarely exists as a dominant paradigm, except when certain religions, with Protestantism as an example, are dominant, and when religion is fading in strength, such that material concerns become greater than spiritual ones.