When people are facing jail time, they are usually told to expect to be brutalized in prison by the other prisoners and guards.
Putting additional punishment in the form of abuse (physical, mental and sexual) and then putting the onus of that additional punishment on a vulnerable population is a recipe for disaster.
Prison is the punishment, anything on top of that is a crime and a lot of people turn short sentences into life by targeting other prisoners with certain crimes.
This culture of retribution runs deep.