 A second way to respond to Kolber's argument is to reject the premise that retributivists must justify imposing greater subjective suffering on some rather than others as a matter of retributive justice. As was pointed out in  section 2.1,  punishment must be intentional; what results as a mere side-effect of punishment is not itself part of the punishment. Retributivists can intend to impose punishments that will generally be experienced as more severe—for example, longer prison terms or more austere prisons—the more serious the wrong for which they are imposed, knowing but not intending that different people will experience the same term in the same prison differently.