People see others in an emergency situation without rescue, not because of the loss of human nature, but because other people are present, reducing their sense of responsibility, thereby suppressing people's motivation for rescue. This kind of decentralized mentality, also known as bystander The effect of individual responsibility becomes unclear, so the sense of responsibility dilutes, and things eventually happen in a way that everyone thinks it will not happen. Because of the "spread of responsibility", it is not right to see what is happening, and to see the evil that comes from death. Feelings and guilt will also spread to other people. The risk of a person's moral evaluation is greatly reduced, and the intensity of the moral condemnation he feels is greatly reduced, so it is entirely possible to adopt the same attitude in the next similar situation. And behavior. What does this text mainly introduce? ['Measures to avoid moral indifference.', 'Causes of Moral Indifference.', 'The psychological mechanism of the bystander effect.', 'The background environment in which the onlooker effect is emerging.']