“In debates about the death penalty, I had started arguing that we would never think it was humane to pay someone to rape people convicted of rape or assault and abuse someone guilty of assault or abuse. Yet we were comfortable killing people who kill, in part because we think we can do it in a manner that doesn’t implicate our own humanity, the way that raping or abusing someone would. I couldn’t stop thinking that we don’t spend much time contemplating the details of what killing someone actually involves.”