The research that led to this paper was supported by a small research grant from the Spencer Foundation (Grant Award No. 201600055). This paper benefited greatly from feedback received from two anonymous referees from this journal. I received helpful comments on earlier drafts of the paper from audiences at Macquarie University, the University of Waikato, the University of Leeds Interdisciplinary Applied Ethics Centre, and the Institute of Philosophy in London, and also from Anjalee de Silva, Christina Easton, Toby Handfield, Rae Langton, Maxime Lepoutre, Mary Kate McGowan, Louise Richardson-Self, and Heather Whitney. Thanks also to Michael Olson, Joseph Ulatowski, Joe Saunders, and Ophelia Deroy for the opportunity to present this work at Macquarie, Waikato, Leeds, and the Institute of Philosophy respectively.