This should start from the Tang Dynasty. After the Anshi Rebellion, the vassal regions were independent, the court was subject to experts, and experts were subject to arrogant soldiers. Therefore, the world is in chaos. If we want to stabilize the world again, we must suppress the arrogant soldiers. Therefore, it is the policy of the imperial court to use literature to control martial arts and overcorrect it.

For military commanders, it can be said that they are burdened with the original sin of bringing trouble to the world after the Anshi Rebellion and dare not stand out. For a civil servant, he is a successful manager of a stable dynasty, and the contest will have obvious psychological advantages. This is moral and ethical.

Due to the lack of cavalry, Song Jun can't pursue victory and expand the results, and it is easy to suffer heavy losses when it fails. Liao and Xixia, which had the advantage of cavalry, could not win the victory, so they maintained general peace in the form of ancient coins. It gives people a feeling of weakness, which is in military diplomacy.

Song Dynasty is an unprecedented developed society, regarded as the peak of China's ancient economy, surrounded by poor countries. Does it make sense for the rich to rob the poor? Why not use money to solve it? Rich people tend to think so, which is social psychology.