  There is widespread agreement that identity is at least a necessary condition for accountability. The way this idea is most often expressed is that one can be responsible only for one's own actions. Sometimes this is put more expansively: I can be responsible for my own actions, and I cannot be responsible for anyone else's actions (Sider 2001, 4, 143, 203–204; Schechtman 1996, 14; Olson 1997, 59). But these ways of putting the matter are just supposed to be a gloss on the philosophical slogan that moral responsibility presupposes personal identity (Butler 1736, 99–105; Reid 1785, 107–118; DeGrazia 2005, 88–89; Glannon 1998; Parfit 1984, 323–326; Parfit 1986, 837–843).