The first is to seize Wu Sangui's concubine Chen Yuanyuan, which is already a fait accompli, leading Wu Sangui to directly join forces with the Qing army to attack Li Chuangwang. In this case, it seems too late for you to pursue the responsibility again. If you kill Liu Zongmin, and Wu Sangui can cooperate with Li Chuangwang, it will definitely kill him. However, this is impossible. Therefore, the pursuit is meaningless. Won't it be better to win him over and let him fight with Wu Sangui?
Secondly, Liu Zongmin was loyal to Li Chuangwang, though he couldn't say it was a mountain, and actively assisted Li Chuangwang to proclaim himself emperor. If it weren't for him, Li Chuangwang wouldn't have proclaimed himself so soon. Their relationship is somewhat similar to that of Sun Quan and Zhou Yu. Without Zhou Yu, Sun Quan would not be emperor, at least not so soon. In this case, you killed Liu Zongmin. Are you stupid? What do you think of the people who follow you? Will they rise up against the king for fear of being killed?
Third, Li Chuangwang's prestige is not as high as expected. He won the support of young people in the army, but many old people trusted Liu Zongmin more. In this way, if you kill Liu Zongmin, you will stir up a hornet's nest. Veterans in the army will definitely not let you kill someone who is loyal to you and rob others of their money just because of a woman? So, Li Chuangwang wouldn't do such a thing. If he does this, he will dig his own grave! Don't you think so?
Liu Zongmin may know his role, so he acted rashly. As a result, the regime was overthrown in a short time, or he did not learn from Liu Bangjin's experience in Guanzhong.