What is the central idea of this song?

As the theme song of "Bao Qingtian", Li Bai's poem "But since the water is still flowing, although we cut it with swords, we raise our glasses to drown our sorrows" appears in the lyrics, which means that since the Five Dynasties and Ten Kingdoms, warlords have scuffled and public security has been destroyed, which has brought endless disasters to the people of the whole country. Why did the heirs of feudal rulers give up their original intention of saving the world and people? Although the Anshi Rebellion, the Five Dynasties and Ten Kingdoms warlords and the contradiction between the people and the rulers, the country was unified, and a new order appeared. Bao Qingtian was fortunate to appear in the world, and punished the injustice and sin of the world with law and discipline. Home from all over the world, people can live the life of two birds in Qi Fei. We must find ways to abandon the vulgar lifestyle and the pursuit of low-grade life. I really envy the superb realm of butterfly paintings by Shixian and Teng Pai. I hope that the rest of my life will not be abandoned and will shine.