Good vs. Evil

1. Where there are no inflexible principles, people treat one another badly because there's nothing to stop them (e.g., slavery).

2. Where there are inflexible principles, people treat one another better because they are held to standards (e.g., laws disallowing inhumane treatment of others).

2. Where there are inflexible principles, people treat one another badly, because of the inflexible principles (e.g., the European Wars of Religion).

3. Where there are inflexible principles, people treat one another badly, because the invention of good is impliedly the invention of evil. 

The moral balance sheet of monotheistic-dualistic religions is impossible to tally. 

If cosmic good and cosmic evil were real, multiple perspectives would not exist with regard to the moral dimension of events in human history, just as there are no ordinary, valid differences of perspective on physical laws, such as gravity. But perspective does exist: The same events can be regarded by different parties as immensely good, immensely bad, neither good nor bad, on a continuum between good and bad, and so forth. 

Instead of cosmic good and evil, the universe has aspects, features, qualities: Anger, Kindness, Desk, Cat, Star, Boredom, etc. This is borne out by everyday experience and science (unless you subscribe to the untalked about implicit assumption of many popular science writers that a composite thing has less metaphysical realness than its constituent elements).