[malloryerik]

You mean on what basis do we justify ownership and property? As far as I can see there's no strong intrinsic justification for private property, but rather it's subordinate to other values like justice and well-being. History is filled with various approaches to property, and at least in my point of view I have to consider it as something decided by politics and culture.

Btw that doesn't mean that because you might disagree with your society's approach to property that it's morally defensible to steal, etc.