In the movie "Demolition Man," cryogenically freezing prisoners was portrayed as a method of rehabilitation and punishment. The primary benefit of cryogenic freezing, as depicted in the film, was to remove violent individuals from society and effectively "freeze" them in time. By freezing the prisoners, they were essentially put on ice, suspended in a state of hibernation, and kept away from the general population for an extended period.
During their time in cryogenic suspension, the prisoners' bodies were kept in stasis, while their minds were subjected to a virtual reality rehabilitation program known as "mind rehabilitation." The idea behind this process was to recondition the prisoners' thoughts and behaviors, reforming them into law-abiding citizens.
The intention of cryogenic freezing in the movie was to give society a chance to "rehabilitate" and "re-educate" the prisoners, so that when they were eventually thawed out and released, they would have been transformed into law-abiding individuals who had learned the error of their ways.
It's important to note that "Demolition Man" is a work of science fiction and its portrayal of cryogenic freezing and rehabilitation should not be taken as an accurate representation of real-world practices or benefits. Cryogenic freezing is not currently used as a method of rehabilitation in the criminal justice system.