In their book The Will to Kill ​ — Making Sense of Senseless Murder, Professors James Alan Fox and Jack Levin state: “Some individuals are more prone to violence than others, yet free will still exists.
Dalam buku mereka, The Will to Kill ​ —⁠ Making Sense of Senseless Murder, Profesor James Alan Fox dan Profesor Jack Levin menyatakan, ” Beberapa individu lebih cenderung melakukan kekerasan daripada yang lain, tetapi kebebasan berkehendak tetap ada.