The document discusses the fundamental attribution error (FAE), which is the tendency to judge others' behaviors based on internal characteristics rather than external factors. It provides examples of FAE, such as attributing rudeness to someone's personality rather than their rough day. FAE can lead to propaganda that dehumanizes outgroups to increase ingroup cohesion. Groupthink, where groups prioritize consensus over good decisions, is also discussed. Examples of preventing groupthink include assigning critical roles and considering alternative perspectives. The document suggests FAE, risky shift, ingroup/outgroup bias, and groupthink can be used to persuade others if external factors are ignored.