The Psychology of Evil: 22 Normal Behaviors That Turn Ordinary People into Monsters

7. Desensitization

Desensitization occurs when repeated exposure to violence or cruelty dulls our emotional responses. Over time, witnessing or participating in harmful acts can make them seem less shocking or wrong. Media violence studies, like those discussed by the APA, show how this effect can develop. As empathy fades, people become more willing—and even able—to inflict harm, simply because it no longer feels extraordinary or disturbing.