The Science of Evil: On Empathy and the Origins of Cruelty: Summary & Key Insights

Empathy, as I define it, involves two distinct but interconnected processes: cognitive empathy and affective empathy. Cognitive empathy is the ability to recognize and infer what someone else is thinking or feeling. It is the intellectual identification of another’s mental state. Affective empathy, by contrast, is our emotional resonance—the capacity to feel what another feels, to share their joy or pain. These two dimensions are separable yet interdependent. One can understand another’s sadness without feeling it; likewise, one can feel distress at another’s suffering without fully grasping the reasons behind it.

Empathy is not synonymous with kindness, nor is its absence synonymous with cruelty. It is a lens through which we perceive others. Like vision, it can be clear or blurred, narrow or expansive. Psychological and neurological studies reveal that empathy involves multiple brain regions: the medial prefrontal cortex allows us to step into another’s shoes, while the orbitofrontal cortex and amygdala help us translate that understanding into appropriate emotional response.

When I map empathy scientifically, I picture it as a dynamic system, not a static trait. Our empathic functioning varies depending on stress, social context, hormones, and even sleep. There are moments in daily life when empathy diminishes temporarily—we snap at loved ones under pressure, overlook suffering when we are preoccupied, or fail to register another’s distress in a crowd. Recognizing the fragility of empathy is key to understanding how cruelty can arise in ordinary circumstances.

The central thesis of my book is straightforward: acts of cruelty are the result of empathy erosion. When empathy diminishes, our ability to treat others as full human beings is compromised. The erosion can be transient—caused by stress, trauma, or ideologically driven detachment—or it can be chronic, embedded in personality or neurological dysfunction.

Empathy erosion explains how ordinary people can participate in acts of harm when social forces diminish their capacity to emotionally connect with others. It provides a scientific framework for atrocities that moral philosophy alone struggles to account for. Under extreme stress or ideological conditioning, entire groups can undergo collective empathy erosion, as seen in genocides, systemic oppression, or institutional neglect.

This model also reframes cruelty in a way that avoids moral dichotomy. Rather than labeling a person as 'evil,' I urge you to see the erosion of empathy as a measurable psychological process. Understanding empathy scientifically makes compassion more actionable. It becomes something that can be studied, restored, and strengthened, rather than merely preached.