The person who destroys a sandcastle isn’t necessarily someone who intends to cause destruction. Accidents happen. What matters is the intent. Bullies, on the other hand, set back the culture—not because of the things they hurt but because they make the rest of us hesitate. How much better could things be if we assumed the best intent? It’s not something we are programmed to do. The few bullies make it harder for the collective to assume the best. At the same time, assuming the worst is a rotten way to live.