From the Tang Dynasty to the Song Dynasty, how did the thinking of the common people change from openness to conservatism?

Because of the emergence of Cheng-Zhu rationalization in the Song Dynasty, which advocated the survival of heaven and the destruction of humanity, the people became more and more conservative under the influence of Cheng-Zhu rationalization promoted by the ruling class after the Song Dynasty.

During the Tang Dynasty, the culture of the Tang Dynasty was very open, and this openness was not only reflected in the treatment of women, but also in the culture and economy, which were very open. Of course, the women of the Tang Dynasty were the women with the highest social status in ancient times, and the Song Dynasty began to advocate the concept of chastity, not to mention re-marriage and whatnot, and even the women who were seen by the man's body is a kind of behavior that is out of place,

This great change in the minds of the people was actually due to the change in the attitude of the ruling class at that time, during the period of the Great Tang Dynasty, the rulers of the Great Tang Dynasty were very enlightened, perhaps related to the fact that they had a Hutu ancestry in their bodies, so they were open to both men and women and ethnic groups, and of course, at that time, the Great Tang Dynasty was a prosperous country and the most powerful country in the world, so this kind of openness of them was very important. Of course, at that time, Great Tang was a prosperous country and the most powerful country in the world, so they had a base for this kind of openness, but when it came to the Song Dynasty, the military power of the Song Dynasty has always been criticized by the later generations, and they also survived under the encirclement of several ethnic regimes, so the Song rulers kept a vigilant attitude from time to time.

So the rulers of the Song dynasty did not dare to adopt an open state policy, and it was also because of the change in the attitude of the rulers of the Song dynasty, so the Song dynasty began the rise of Cheng-Zhu rationalism, and got the rulers after the Song dynasty to actively promote it, so the people's thinking only changed from the openness of the Shengtang to the conservative.