Li Zicheng is a peasant, and he represents the poor peasants in the world. On behalf of those farmers, he fought against the upper class. Wu Sangui is a scholar-bureaucrat and a representative of the upper class. He needs to safeguard the interests of himself and his class. The interests of the peasant class conflict with those of the upper class, and it is inevitable that they cannot come together. However, more than that, Li Zicheng even showed leniency to the common people, to the detriment of their interests. In Wu Sangui's view, they are not only different in class contradictions, but also different in Li Zicheng's personality.
Although the Manchu army was a foreign aggressor, Wu Sangui had no class contradiction with them, and as a capitulator, the Manchu army would give preferential treatment, which was certain, because Wu Sangui's uncle surrendered to the Manchu army at that time and was highly valued. But after surrendering to Li Zicheng, there was only one way for Wu Sangui, and that was death.
At that time, the Manchu army had a well-trained army with strong combat effectiveness. But the Dashun Army in Li Zicheng is a farmer, and they have not experienced the training of vibration industry. Although there were many resistance troops along the way, they were all young rookies in the Ming army. If we really deal with the well-trained Manchu army, Dashun army will only be beaten. Under such circumstances, Wu Sangui surrendered to the Manchu army, which conformed to the situation at that time.
Gao Yuanyuan's little accident also became the reason why Wu Sangui refused to submit to Li Zicheng. Since Wu Sangui surrendered, he should be kind to his family and concubines. But Li Zicheng didn't. Instead, he indulged his men to occupy Gao Yuanyuan. There is no sincerity at all, and there are problems with character and virtue. How can he have a good future with such a person?