Morality must be innately subjective as no one person has an objective view point outside of The One True God™ as they would be able to perceive all of the universe at once perfectly. Therefore, the only other way to reach an objective morality is to come to a consensus as a whole collective of humans. To even remove sociopaths from the collective humanity upon which we base morality, you'd first have to find a way to identify with 100% accuracy and perfect definition (outside of using morality itself) of what constitutes a sociopath or not and then use that as a foundation to allow a designation of what "real humanity" is. Quinn's hypothetical scenario does not need to be answered as no human can take a truly random action as by the nature of dedicating themselves to the notion of taking a truly random action necessitates an impulse of conscious and/or sub-conscious thought that is prone to the biases of your own mind. Therefore, there is no action that lacks deeper context upon which all of humanity could come to a central idea of what is or is not morally good or bad. Implying that people take morally bad actions (such as rape) while KNOWING they are morally bad actions necessitates a fundamental understanding within humanity as a collective whole about the morality of all actions that is instilled upon birth and thus we can never learn anything more in our entire lives and we have no potential to grow emotionally or intellectually from when we are a baby.