In turn, we have also damaged our planet with our inventions in ways that no other species can take responsibility for. Our minds have created the best and worst of our planet. In terms of biology, as human beings, Freud believes that our goal is self-preservation through the reality principle. Animals are biologically more rigid in their behavior and determination. Interestingly, Darwin, on the other hand, believed that humans were just a species of animals and that our nature was deterministic and reacted to the environment. Freud differs in that he distinguishes human beings based on our capacity to know, to think rationally, and to investigate, analyze, or psychoanalyze why people do what they do. For example, stealing, killing, writing a song, etc. It is Freud who can explain what went wrong with Manson and his mind. Freud stated that human beings are driven by their unconscious drives and instincts, which include aggression and sex. This would also apply to the animal kingdom. However, all human beings have an unconscious death wish, or death instinct. Self-destructive behavior arises from the death drive. Aggression and violence are when there is the death instinct