Emperor Chongzhen would rather commit suicide in Jingshan Park than transfer Ningyuan fighters to the Central Plains to fight Li Zicheng. Just for that promise?

The Ming Dynasty was a political power established by the Han nationality. It was established on the basis of expelling Mongolia (Yuan Dynasty). Influenced by Confucianism, the concept of rulers is that they would rather die at their own hands than at the hands of barbarians. Moreover, if the Ming Dynasty was destroyed by the Qing Dynasty, wouldn't it let history and future generations see the jokes of the Ming Dynasty? He expelled Mongolia himself, but was destroyed by the Shao nationality. Therefore, it makes sense that Chongzhen would rather die than let go.

Later history is such a trajectory, Ming died in the hands of Li Zicheng, but Li Zicheng and other forces died in the hands of Qing. Although the Ming Dynasty perished, according to the traditional view, it still retained a little face.