Studies have found that the amount of empathy we feel towards other living beings depends on our brain wiring. Empathy is a key measuring tool to distinguish good from bad.
Altruism and psychopathy exemplify the best and the worst human instincts. According to researchers from the University of Chicago, humans have two sides because they were both important for the survival of species.
They assume that humans needed to work together in big groups at first, but because they had to compete for resources, scaring and killing opponents was also important for survival.
Both good and bad seem to be connected to the key emotional characteristic — empathy, which is a genuine ability of the brain to understand how someone else is feeling.
Researchers have found that empathy is responsible for why we help those in need and distress. People with antisocial behaviors such as psychopathy are far from emphatic, which is apparently due to impaired neural circuits.