Minimum mandatory sentences increase the chance of rehabilitation. If a person receives a light punishment for his/her action, he/she sees that the action has a low cost. Conversely, if a person has firsthand experience with strong punishment for an action, they will be more reluctant to take that action in the future. Furthermore, prisons have literacy and work training programs to benefit criminals; the majority of (American) prisoners are functionally illiterate. [1] If these criminals are in prison for a short period of time, they will not be able to reap the benefits of these rehabilitating programs. Thus longer sentences (within reason) can actually be beneficial to inmates.  [1] Craig Haney, “Prison Overcrowding: Harmful Consequences and Dysfunctional Reactions,” Vera Institute of Justice, 85.