In the history class, Li Zicheng may be regarded as the peasant leader of the uprising, with certain benevolence and morality. But judging from what he has done, he lacks long-term vision, which is the limitation of peasant origin. We know a ballad, one of which is that the king has come and won't accept food, which is much like fighting local tyrants to divide the fields. But it is completely different in essence, because the former can still ensure the operation of state taxation by dividing land, while the latter is equivalent to exempting the people of the whole country from taxation in disguise.
Without taxes, the state has no resources to maintain the operation of the military and court institutions. If this is still the case after the founding of the People's Republic of China, Li Zicheng and others will even drink the northwest wind. It is easier to reduce taxes than to increase taxes. If taxes are increased later, it will increase people's resentment. What's more, Chu Zhuangwang's army has always been generous, using money and food from Chongzhen and the rich gentry to buy people's hearts. If all these people are dead, where will they get money and food?
The reason why the invaders lost so quickly was also related to their lack of a solid rear. They had no foundation and went straight to Beijing, but everything around Beijing was smashed. Without Jiubian and Shanhaiguan, it is basically an isolated city. Therefore, after being defeated by the coalition forces of Wu Sangui and Dourgen, Li Zicheng's army fled all the way, and there was no possibility of reorganizing the defensive offensive. This is also because he was a little blind before.