When we are angry at evil, we are acknowledging that life has purpose. We are recognizing that there is a difference between good and bad. We are affirming that bad should be punished. But what does that mean for my bad actions? And from where did my sense of justice come in the first place? If life is the result of an accident, how can life have a purpose? And if life has no purpose, why am I angry at what I think is unfair?
My sense of oughtness is an indication that I believe in a standard of life. But what standard, an arbitrary one set by changing cultures driven by natural selection or a transcendent one that never changes even though societies might? Mankind’s sense of justice can point them to the good Judge.