While many may wonder how a morally respectable God could allow human beings to get this bad, the more basic question is: Without the context of God as a standard of goodness and humans are morally accountable to him, why think humans really are evil? Aren’t they just abnormal maladjusted, dysfunctional, statistically deviant, or highly individualistic? Therapeutic or psychoanalytic categories are simply insufficient to account for the deep evils that exist. Various Eastern views are similarly inept. For example, Arthur Koestler tells of one Zen Buddhist scholar calling Hitler’s gas chambers “very silly,” claiming that evil is “relative” and merely “a Christian concept.” The very clear existence of evil, we’ve noted, suggests a standard of goodness or design plan: evil is a deviation from or corruption of this standard and a departure from what ought to be. To say that the actions of Hitler, Stalin, Pol Pot, Mao Tse Tung, or even the Columbine killers were simply “abnormal” or “maladjusted,” not evil, is not only hollow, but grotesquely distorted.
— Paul Copan, from Loving Wisdom, kindle location 2039