 The role of the PSR in ethics and political theory has not been seriously studied so far. Clearly, the PSR may be marshaled in order to question our reliance on mere intuitions. The repugnance of a certain view cannot be taken at face value, but rather requires a justification. In the past, various racist and conservative views relied merely on the alleged repugnance of certain sexual acts (e.g., homosexuality, interracial relations). The requirement to dig deeper and ask a person to justify her intuitions may help the person understand the maxims guiding her specific moral beliefs. Adherence to the PSR may also shift the onus of proof in the debate between those who consider our preferential evaluation of human beings over other things in nature as simply brute (Williams 2006: 195) and those who insist that if human beings have a special value, there must be a reason for the ascription of such value (Buss 2012: 343).