However, these desiderata seemingly form an inconsistent triad, and thus a trilemma.
2.
If one finds oneself believing all three propositions of an inconsistent triad, then ( in order to be rational ) one must give up or modify at least one of those beliefs.
3.
Hadley's own contribution drew attention to a perceived inconsistent triad in animal rights philosophy : the idea that moral status is determined by psychological factors ( like sentience ), and not species; that human and nonhuman animals are of the same genomic plasticity offers the best explanation for change in natural selection.