Desert as an Upper Bound: Justifying Leniency and Rehabilitation Beyond What Offenders Deserve

The theory of penal legitimacy has long revolved around the "just desert" principle, which holds that offenders deserve punishment commensurate with their moral wrongdoing. However, in practice, punishment systems centered on just desert—especially in highly punitive institutional environments—have not only failed to effectively reduce recidivism rates but also been accompanied by severe human rights issues and social exclusion effects. This reality raises a fundamental normative question: Can, and in what sense can, criminal punishment treat offenders in a manner that goes beyond their strict just desert? This paper argues that the just desert principle should not be understood as a baseline that punishment must meet, but rather redefined as the moral upper bound of penal legitimacy. Drawing on the well-established penal philosophy framework of "Limiting Retributivism," this paper demonstrates that, on the premise of not violating the principles of responsibility and proportionality, institutionally adopting lenient and rehabilitative measures for offenders that are below their maximum just desert is morally legitimate and socially beneficial. Furthermore, by integrating empirical research in comparative criminal justice, the paper illustrates the systematic failure of pure retributive punishment systems in practice. It also introduces the normative concept of restorative justice to show how the punishment model of "beyond just desert" can simultaneously promote responsibility-taking, social integration, and public safety. By repositioning just desert as the restrictive boundary of punishment, this paper provides a theoretical path for contemporary penal reform that balances moral seriousness with humanitarian care.