"Another rationale [for punishment] is rehabilitation. The idea here is to change the criminal in such a way that he will commit no more crimes. Of all the rationales for punishment, this one is the most sinister, and the most discredited, because it is open-ended, not to mention that it is totally ineffective. Punishment as retribution or deterrence comes to an end, when the criminal has gotten his just deserts (retribution) or he has been punished just enough to discourage others from doing what he did (deterrence). But rehabilitation justifies indefinite incarceration, since nobody knows if a prisoner has been rehabilitated, and the authorities, playing it safe, prolong the prisoner’s incarceration (they will get bad publicity if, released, he commits more crimes). Often the prisoner, once released, is not so much rehabilitated as just being an old and broken man, not up for committing crimes because he is not up for anything." - Bob Black, "An Anarchist Response to 'An Anarchist Response to Crime'"