Some people may feel overwhelmed when released. They suddenly have to go to work and get along with people after living in a box having food provided for them.
It may just seem too stressful and they would just commit another crime to go back to jail.
The whole point of Bastoy is that they don't feel overwhelmed and actually learn a thing or two about living in a society.
This absurd situation (where someone wants to go back to jail) only happens when criminals are turned into animals and kept in boxes for extended periods of time without any support.
Some people may feel overwhelmed when released. They suddenly have to go to work and get along with people after living in a box having food provided for them.
It may just seem too stressful and they would just commit another crime to go back to jail.