Human nature is evil - the essence of human nature
Everyone is evil. No doubt you are surrounded by people who eat meat but don't spit bones. A nightmare in human skin! You see good people around you, they are good, not they are born good, how good a person is terrible! There is only a thin layer of paper between the good and the evil. Any bowl of rice noodles, a table, a meal, a seat, or even a look, may cause an argument! Blood spatter five steps, this is the most direct expression of chivalrous culture. There has always been a tradition of pulling out a knife to help the road. You have more or less encountered these things at ordinary times. It's just a trifle, not worth mentioning.