Li Shimin was also ready to kill his brother before the Xuanwumen Rebellion. First of all, tell my father that he was framed by his brother. Secondly, I stressed to my father that I really don't want to be an emperor; In the end, he told his father that his two brothers had repeatedly molested his father's imperial concubine and despised his father's imperial power. Tang Gaozu didn't care about the first two points, but the last one made him fly into a rage. After achieving his goal, Li Shimin set a trap in Xuanwu Gate the next day and shot his brother directly.
But he didn't stop after killing his younger brother, and then he did something that made people angry. He cut off Li Jianmin's head for public display, slaughtered all his nephews who were not sensible, tried to avoid future trouble, and finally forcibly occupied his brothers and sisters directly, with no sense of shame. After doing these things, he was the only person in the Li family who was qualified to inherit, and naturally forced his father to turn himself into a prince. But there are many shady scenes behind this prince, which is obvious to all, so he forced historians to rewrite history and discredit his brother.
Thus, Li Shimin is not only cold-blooded, but also despicable.