Propertarianism can be used to describe, compare, and advocate any political system in rigidly logical, universally commensurable form.
While one can surely advocate liberty with it, its primary purpose is to suppress error, fallacy and deception.
Its the logic of cooperation. The logic of ethics and politics.
Aristocratic Egalitarianism can be argued with it. Which I do every day.
And AE is the most ethical political model yet developed.
But propertarianism only allows me to argue in favor of it logically and truthfully – to construct proofs.
But preference for any given political order is still one if choice.