Assembling recent DP deterrence literature

As I mentioned in class, last year Professors Cass Sunstein and Adrian Vermeule created a stir with a provocative article suggesting that new deterrence evidence might make the death penalty morally required for states concerned with value of life.  Below I have provided links to this paper and various responses it has generated:

• Cass Sunstein & Adrian Vermeule, Is Capital Punishment Morally Required? Acts, Omissions, and Life-Life Tradeoffs

• Carol Steiker, No, Capital Punishment is Not Morally Required: Deterrence, Deontology, and the Death Penalty

• John Donohue & Justin Wolfers, Uses and Abuses of Empirical Evidence in the Death Penalty Debate

• Cass Sunstein & Adrian Vermeule, Deterring Murder: A Reply

• Jeffrey Fagan, Death and Deterrence Redux: Science, Law, and Causal Reasoning on Capital Punishment

• Eric D. Blumenson, Killing in Good Conscience: What's Wrong with Sunstein and Vermeule's Lesser Evil Argument for Capital Punishment and Other Human Rights Violations?

• Thomas Kleven, Is Capital Punishment Immoral Even if it does Deter Murder?