Why did Emperor Wu of the Han Dynasty direct the tragedy "The Disaster of Witchcraft" in his later years?

Emperor Wu of the Han Dynasty was so absurd in his later years. Not only he himself, but also the entire capital Chang'an was absurd. What? If you go back in time, you can see that the streets and palaces of Chang'an City at that time were filled with alchemists and magicians. Witches are even weirder. They roam the harem and teach lonely concubines the secrets of pleasing the emperor and ostracizing other concubines. The concubines had puppets buried in their rooms for sacrifices and curses. This method is the legendary witchcraft, a witchcraft that curses and harms people. It is also called the art of hating victory. The method is not too difficult - use paper figures, straw figures, puppets, bronze statues, etc. as stand-ins for the people being enchanted, carve their names and birthdays, then bury them deeply, or prick them with acupuncture, and then the wizard draws symbols and reads them. curse. It is said that this spell will make the victim unconscious, crazy and out of control, and finally die inexplicably. Such nonsense as superstition and witchcraft had become a fashion trend at that time. Royal relatives, dignitaries and dignitaries follow the trend and are sought after. The dignified palace of the Han Dynasty has become a place where ghosts and monsters are rampant, and all walks of life are quite supportive of it. After tracing it to the end, the initiator of this trend was none other than Emperor Wu of the Han Dynasty himself. In his later years, Emperor Wu of the Han Dynasty believed in alchemists and witchcraft. He once planned to take a boat across the sea to find gods, and visited experts all over the country in search of longevity medicine. In this regard, Emperor Wu of the Han Dynasty can be called Qin Shihuang's biggest fan. Thinking about the time when Qin Shihuang was obsessed with the art of immortality, the alchemist Xu Fu wrote a letter saying that there were three sacred mountains in the sea. Qin Shihuang believed it and sent him to lead three thousand boys and girls on a boat into the sea to seek immortality. The result is unknown. One theory is that he was shipwrecked, another is that he drifted to an island and settled there. According to folklore, he went to Japan. To put it bluntly, fear of death and desire for longevity are human instincts. The emperor is also made of flesh, and he is also afraid of death, but he is not only afraid of losing his life. The most difficult thing to give up is probably his supreme right. Think about it, a lifetime of splendor and splendor dominates the world, and if you turn your face, you will die. In an instant, rise and fall will be over, everything will be gone, everything will be empty, are you willing to let you go? Emperor Wu of the Han Dynasty was superstitious and wanted to live forever. He once cast a giant bronze statue in the palace, twenty feet high. He used a tray to catch the morning dew, and then used the dew obtained to mix the jade shavings with medicine, and drank it as a drink every day in order to prolong life.