Robert Blecker is one of the country’s most impassioned crusaders for capital punishment. A self-described ‘emotive retributivist’ and New York Law School professor, his credo is “Some people deserve to die, and we have an obligation to kill them.” Daryl Holton is one of those people. In 1997, Holton shot his four children to death with an assault rifle in Shelbyville, Tennesse...