The line between good and evil is so thin that sometimes it is impossible to understand where they replace each other. And all these perceptions, of course, are subjective. And change even one person over time or events in his life. Sometimes man, seeking to do good for someone, on fact only worsens situation, therefore makes evil. There is a fine proverb on this case "the road to hell is paved with Good intentions". All these reflections on good and evil can be carried out endlessly. This very huge, subtle and elusive the notion of that there is good, and that there is evil. And sometimes evil turns out to be good and Vice versa. Have you read the book "Master and Margarita" by Bulgakov? There, too, dispute about these notions. This is an eternal question in mankind.