What an immense topic. Self-ownership as a basis for ownership is a sound foundation, but it’s an “I think therefore I am” proposition - necessary to ensure a sound beginning free of assumptions, but so rudimentary that there can be difficulty using it to inform matters on the periphery.
Ownership, Non-Aggression, and even Capitalism, are necessary concepts to usher humanity into the next phase of its social evolution, free from external authority. But this is akin to the first land animal’s steps upon the shore - we will still be FAR from expressing our full potential.
The necessity for mental constructs outlining acceptable behavior is only necessary amongst a species that does not recognize its oneness. This is a subtle concept, but if each saw the other as a variable expression of himself, the above concepts would be entirely obviated.
Survival instinct took us so far, and understanding and discipline regarding morality will take us even further; but there is still much further to go before we reach true peace and prosperity. It will require an earnest worldwide yearning for the continued expansion of consciousness unto greater and greater heights.
Yup, it's a long road ahead, and long overdue we take it. They longer we delay, the longer it takes to get to where we deep down want to go but aren't willing to put in the time, energy, effort, dedication, determination and persistence to find our way and path there.