I just finished reading parts of Dworkin's Justice for Hedgehogs. It claims to defend objectivism in ethics. Yet there is not a single mention of sentience, and of duties to non-human sentient beings. (I may have missed a sentence).
That completely ignores the possibility that all moral value derives from the presence of consciousness and of feeling!
The entire Buddhist tradition -- perhaps as compassionate a tradition as we have had anywhere in human history -- must have been morally misguided !!