In the wake of Oklahoma's mangled killing of Clayton Lockett, John Oliver took on the death penalty on his show Last Week Tonight . Among the hard questions he asks: Should this be allowed in a civilized society, and why is a comedy show talking about this? "It costs up to 10 times more to give someone the death penalty than life in prison. So what we know now is the death penalty is expensive, potentially kills innocent people, and doesn't deter crime. And here is where it gets hard..."