There is a great new book out about it, and I found this wonderful and well written book review.
Here is an extract which explains the purposes which the author feels the death penalty serves in the US - none of which are deterrence or punishment:
Garland concludes that capital punishment today is “reasonably well adapted to the purposes that it serves, but deterrent crime control and retributive justice are not prominent among them.” Instead, the death penalty promotes “gratifications,” of “professional and political users, of the mass media, and of its public audience.” In particular, he contends, capital punishment derives “its emotional power, its popular interest, and its perennial appeal” from five types of “death penalty discourse.” They are: (1) political exploitation of the gap between the Furmandecision and popular opinion; (2) adversarial legal proceedings featuring cultural tensions between capital punishment and liberal humanism; (3) the political association of capital punishment with larger political and cultural issues, such as civil rights, states’ rights, and crime control; (4) demands for revenge; and (5) the emotional power of imagining killing and death. He concludes that “the American death penalty has been transformed from a penal instrument that puts persons to death to a peculiar institution that puts death into discourse for political and cultural purposes.”
