all policies and ideas are part of belief systems. matching them appropriately to reality is the whole point.

the reason why property rights are primary is because respecting them is a universally applicable rule. my property is not protected unless yours is also, by the mental model of an honest society. without that honesty protecting people's property, there is no incentive to produce rather than steal or defraud.

it's the fact that you can't have a functioning society without respect of property rights. sure, you can have hoarders stacking and not using things, denying other people access for no reason except spite, but these are mentally disabled people. most of them are poor and live in houses full of newspapers.

if you don't respect the property rights of all people, you also are implicitly saying that it is not immoral to rob people. if you create exceptions for these rights, that break consent, you can't claim that your exceptions are justice. there is nothing just about being coerced without a verifiable and true liability to do so.