The old man fell to the ground. Will you help him? In the traditional moral atmosphere, this should not be a problem. Today, however, it has become a question of moral choice. From "Peng Yu case" in 2006 to "Yin Hongbin case" and "Xu Yunhe case" this year, due to the intervention of law enforcement factors, this issue has become more confusing. Not long ago, the former Ministry of Health published the Technical Guide of Fall Intervention for the Elderly, and professional technical guidance did not help solve social and moral problems. This reminds us that trust is the most basic requirement of a harmonious society-isn't it? When you turn on the tap, make sure that the water flowing out is not poisonous; When crossing the road, I believe that all cars will stop at the red light; Take the high-speed subway, I believe there will be no sudden rear-end collision; Even if you sleep, believe that this house is not "fragile"; If something happens, I believe that the police are not accomplices of thieves ... If we are afraid of hormones when eating meat, toxins when eating vegetarian food, pigments when drinking drinks and harmful elements when drinking white water, what else can we eat? To tell the truth, as the German sociologist Luhmann said, "When a person completely loses confidence in the world, he can't even get out of bed in the morning." To tell the truth, a nation without trust is hopeless.