Most of us would agree that one strong example of a "not-good" person is the psychopath. Psychopathy is "a psychological condition in which the individual shows a profound lack of empathy for the feelings of others, a willingness to engage in immoral and antisocial behavior for short-term gains, and extreme egocentricity."  This "profound lack of empathy" means he only cares about what he wants and feels no guilt about manipulating or using aggression to get it. These folks scare us. And they teach us something important about the path to goodness: it must include empathy.