Why people punish

Many people say that they believe in punishing criminals only to deter further offenses, but a study of people’s decisions as mock jurors overwhelmingly suggests that they would punish lawbreakers for the purpose of retribution.

“What’s fascinating is that people don’t seem to know why they punish,” says Kevin Carlsmith of Colgate University in Hamilton, N.Y. Scientists call the main categories of punishment utilitarian, for deterring crime, and retributive, for making a criminal suffer.

Few previous studies have explored what motivates punishments, and those studies simply asked people why they favored a sentence. Carlsmith’s three-part study, which appears in the July Journal of Experimental Social Psychology, evaluates the type of information people consider when deciding on a punishment.

In the first test, 132 subjects imagined themselves as jurors and ranked crime-related information in order of its relevance to a sentence. They consistently ranked retributive information, such as criminal intent, higher than utilitarian information, such as a criminal’s record.

In a second test, 42 subjects received nine pieces of information relating to a crime and selected which was most useful in determining a sentence. Ninety-seven percent of subjects chose a piece of retributive information.

A final test revealed that 35 subjects who based their sentences on retributive information were substantially more confident that the punishment they had selected was correct than were subjects who based their sentences on utilitarian information.

Previous research had shown that when asked for the justification behind criminal punishment, people generally split their responses between utility and retribution. Asking someone why he or she would impose punishment is a flawed method because people often don’t know what’s behind their decisions, says John Darley of Princeton University.

From the Nature Index

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