Thing being, I don't even see the necessity for a Concept of Right, which can be generalized from real humans. You can rather dissolve the question. What is Right? That which gets us what we value, insofar as we value it, to the greatest degree possible, with a rational reflection to eliminate values whose implementation shows them to be internally contradictory, accounting for the diversity of others around us.

Even if everyone takes "murderpills", everyone wants to kill but nobody to be killed, so the implementation of the Value of Murder is internally contradictory to the degree that the anarchy, chaos and terror of a continuous murder spree would outweigh the value of the killings themselves for the killers -- particularly given that you can never be assured you're not next!

Right arrives to a sustainable long-term balance.