What is a bad person

What is a bad guy? It is not easy to define. You can treat it as a childish question, or as a philosophical question. In the eyes of a child, the world is either black or white. But in the eyes of a sage, it is different again. "All people can become Yao and Shun" is a famous saying of Mencius, while Xunzi thinks that human nature is originally evil. But whether it is inherently good or inherently evil, we do not have to dwell too much on the simplest starting point, from the human morality, to see what is bad.