Generally speaking, punishment has three purposes, namely, retribution, rehabilitation, and deterrence. Not all three must be realized in each case for a punish

Generally speaking, punishment has three purposes, namely, retribution, rehabilitation, and deterrence. Not all three must be realized in each case for a punishment to be valid, but all three are nonetheless in play. We do a poor job in this respect. We seem incapable of integrating all three. So you have people who get irrationally squeamish about retribution, demonstrating a total lack of understanding and appreciation of the severity of crimes and of the nature and demands of justice. False compassion abounds. Some people cannot distinguish between chattel slavery and debt slavery (where in the latter case, this would mean penal labor, something that can have the benefit of both providing value to the society wronged to whom the perp is indebted and in punishing the perp). You have people who express hatred for the guilty under the pretense of justice, caring nothing for their rehabilitation. You have those who claim that the prospect of punishment doesn't deter crime, which is patently absurd. The justice system should most definitely punish criminals prudently in proportion with the crime, but it should also provide means of correcting the person and leading them away from a criminal life. Learning skills could be a part, even if not exhaustive, of such a rehabilitation, whether they ever leave prison or not.