A recent study in Israel used brain scans to explore the differences in empathy between political liberals and conservatives. The researchers found that when imagining other people suffering, liberals showed stronger brain reactions associated with empathy compared to conservatives. This pattern of brain activity was linked to participants’ self-reported political beliefs and their acceptance of right-wing values. The study was published in Social Cognitive and Affective Neuroscience. …
I would argue lack of empathy is mental illness.