The psychology of public shaming, relational aggression, and collective punishment Online communities are built on trust, shared interests, and cooperation. At their best, they allow people with different backgrounds and perspectives to work together toward something meaningful. The same relationships can also become channels for exclusion, reputational damage, and collective hostility. Sometimes someone deliberately encourages this. Sometimes nobody is coordinating anything. A community can collectively harm an individual even when every participant believes they are acting morally. Understanding how that happens is essential to building healthy communities.