In a well defined legal system, there are known consequences for various crimes.
Retribution is necessary in cases were the crime is unlikely to happen again. For example, Martha Stewart is unlikely to get involved in stock market scandal again so there is no reason for deterrence, but she should have a retributive punishment because she broke the social contract and she knew that there would be consequences if she was caught. Retribution should only be used in these types of cases.
Prevention and deterrence should be the most common forms of punishment. Assuring that a criminal will not recommit a crime is absolutely vital to our society. In the case of a minor infraction, the criminal should be sent to jail in order to stop himher from reve