It is possible the idea of personal property is foreign to ET, so taking a cow might seem like picking fruit off a tree.
I wonder if it would even be possible to teach ET such a concept.
A big job "reworking" that structure for an entire planet.But really it would involve reworking the legal and security structure in the entire world; or at least the oecd to begin with. Surely everyone would see the need for a united front and consistent laws across the globe with the threat of alien interference. The pessimist in me worries that countries would fight more and try and align with factions of aliens to get an edge, making a global strategy moot.
OECD? Organisation for Economic Co-operation and Development, a World Wide economy organization?
Not that familar with them, track record of legislating global laws? Seems like United Nations would be a good (better?) choice.
As for countries fighting for the power ET tech could provide, seems like we are already there.