  Still other critics (Sandel 2007; Kass 2003) highlight the ways in which the motivations for the genetic improvement of our offspring express hubris, a “drive to mastery” (Sandel 2007: 27) that, left unchecked, threatens not just human nature, but the meaning of parent-child relationships, from openness to the “unbidden” and unconditional love to design and manufacture (Kass 2003); from loving whatever child comes along, to loving a particular child because of chosen traits (Herissone-Kelly 2007).