 Some critics of retributivism reject this limitation as an appeal to a “definitional stop”, which they say is illicitly used to avoid having to justify the costs of the practice (Hart 1968: 5–6; Christopher 2002: 879–880). The worry is that retributivists will seek to justify only the purposeful infliction of hardship on wrongdoers, and will ignore the overall costs of the practice. But there is no reason to think that retributivists generally ignore the need to justify the negative effects of punishment on the innocent (see  section 4.5).  The retributivist's point is only that the intentional infliction of hard treatment has to be justified in a different way than the collateral damage that may befall either the criminal or the innocent as a result of punishing the former.