I keep a crumpled and yellowed article on my desk next to my computer. I cut it out from The New York Times nine years ago. I've never known quite where to file it, so it sits underneath my keyboard.

The article recounts the court trial and conviction of Bobby Frank Cherry, a former Ku Klux Klan member who was sentenced to life in prison for the 1963 murder of four little girls after bombing the 16th ...