The reason is explained in the front matter: “On one level, the data is simply a part of a mundane programming book. On another, each row represents immense suffering, lives lost, and in some cases amazing redemption and acceptance. In preparing for this dataset, I was deeply moved by a number of the statements and found myself re-evaluting my position on capital punishment. I hope that as we examine the data, you too will contemplate the deeper issues at play.”