I believe that, where it exists as a punishment for unlawful killing, the death penalty deters some potential murderers. I believe that, perversely, it can also make those who have already killed more likely to kill again. I believe that states should not execute their citizens. I believe that culpability for a crime should depend on an offender’s understanding of right and wrong and not on his or her age. I believe that the extent of an individual’s responsibility can be extremely difficult to determine. I believe that the USA’s federal system is, in many ways, a fine model for the government of a large nation. These are some of the reasons why thinking about this makes my head hurt.