Several viewpoints are presented in this good discussion from the New York Times about whether increased imprisonment rates drive down crime rates; which answer is so obviously yes, that it boggles the mind that otherwise intelligent people can still say no, but they do, and you can read their reasoning in this series of answers.
Even many of the nation’s police chiefs have called for reducing the number of people, particularly minorities, sent to prison. But the news that a man suspected of murdering a New York City police officer had been given break after break, and was free because he had been allowed to enter a diversion program rather than be jailed on drug charges, have led even supporters of such programs to raise questions about them.
With some already saying that crime may be rising, are we moving too fast to embrace limits on incarceration, such as diversion programs and drug courts? Could such measures actually increase the risk of crime?
Retrieved October 29, 2015 from http://www.nytimes.com/roomfordebate/2015/10/29/will-crime-rise-if-more-people-are-kept-out-of-prison