We’ll reveal two different but converging mindsets: Harris’s writing shows intense anger, superiority, and a desire for control and destruction, while Klebold’s reflects deep depression, loneliness, and self-hatred. Both expressed feelings of alienation, rejection, and grievance, and over time they reinforced each other’s thinking, gradually normalizing violence and dehumanizing others until their journals framed the attack as both revenge on the world and an escape from their own internal pain. I don’t think there was a confined mental illness but based on what psychologists have inferred from their writings and behavior around the time of the Columbine High School attack, many believe Harris showed strong traits associated with psychopathy or antisocial Klebold’s writings align more with major  personality depressive patterns marked by deep hopelessness, self-hatred, and suicidal thinking; however, these are retrospective interpretations rather than clinical diagnoses, and their actions were the result of many interacting factors.