“If only it were all so simple! If only there were evil people somewhere insidiously committing evil deeds, and it were necessary only to separate them from the rest of us and destroy them. But the line dividing good and evil cuts through the heart of every human being. And who is willing to destroy a piece of his own heart?” ― Aleksandr Solzhenitsyn
The nature of evil is intrinsically linked to the nature of humanity. Indeed, we have proven ourselves capable of great goods, fantastic feats, and momentous achievements. But good cannot exist without its opposite, and to make the claim that humans are good must include the claim that humans possess evil, malice, vice.
If we assume that evil exists within each and every person, it seems worthwhile to make a legitimate attempt to understand it. Otherwise, we risk putting the atrocities of history carried out by man into a fictional box that certainly could not or would not happen again or to us.