Why didn't Xiang Yu kill Liu Bang at the Hongmen banquet?

It can be said that Xiang Yu had a full chance to kill Liu Bang, or that the Hongmen Banquet was originally intended to kill Liu Bang, just like the article we read in high school, which vividly showed the whole process of the Hongmen Banquet. The main reason is that although Xiang Yu is ambitious, his heart is still relatively soft. Although Liu Bang doesn't have Xiang Yu's heart, he is eloquent. He just said a lot of nice things to apologize to Xiang Yu at the Hongmen banquet prepared by Xiang Yu, and Xiang Yu's heart softened.

Moreover, there are several people in Xiang Yu who don't want Liu Bang to be killed. Liu bang is kind-hearted, and those who help secretly know how to repay kindness. In the process of Xiang Zhuang's sword dance, Xiang Bo protected Liu Bang with his own body, so there was no way to assassinate him. Before the hongmen banquet, Xiang Bo secretly told him the plan to assassinate Liu Xiangyu, so Liu Bang was much more vigilant.

In short, although ambitious, the enemy who has no way to start is a stumbling block on the road to success. Therefore, in the end, the person who is ambitious and can own the world can only be Liu Bang, and it is impossible to stop Xiang Yu from killing Liu Bang.