Sin is also a necessary piece of our mental furniture because sin is communal, while error is individual. You make a mistake, but we are all plagued by sins like selfishness and thoughtlessness. Sin is baked into our nature and is handed down through the generations. We are all sinners together. To be aware of sin is to feel intense sympathy toward others who sin. It is to be reminded that as the plight of sin is communal, so the solutions are communal. We fight sin together, as communities and families, fighting our own individual sins by helping others fight theirs.
