Liu Che, the Emperor of the Han Dynasty, was a great and promising monarch, who completely freed the Han Dynasty from the threat of Xiongnu. Emperor Wu of the Han Dynasty entered its heyday, but the national treasury was empty every year. The superstition and arbitrariness of Emperor Wu of the Han Dynasty increased the burden on the people, and he left a barely peaceful dynasty to future generations.

Liu Fuling, Emperor Zhao Di of the Han Dynasty, was a wise monarch. With the help of Huo Guang, he succeeded Liang Wudi well, and maintained the Han Dynasty in a relatively prosperous era. There are not many records about Zhao Di's murder in history, which may be related to his early death.

During the reign of Liu Bingyi and Xuan Di, the national strength got a certain rebound, which was called "Xuan Di Renaissance" in history. Liu Bingyi once taught the prince to combine law with Confucianism and not be too kind.

Judging from the actions of the three emperors in the Han Dynasty, what you said about killing people like hemp and ignoring human life is basically untenable. Adhering to the principle of "Confucianism outside and law inside", they taught the people all over the world to support the central rule while not forgetting to use the law to regulate their behavior. But they are all arbitrary and superstitious about the power of law, so the civil tax is very heavy when they are in office. Moreover, China's political transformation from a hundred schools of thought contended in the Spring and Autumn Period and the Warring States Period to a centralized autocracy that only respected Confucianism consolidated the unification of China, but made the monarchy above the law. From this point of view, during the reign of the three of them, cruel officials were rampant, and countless people died of criminal law and abnormal deaths. They are responsible for these.

The basic attributes of a politician are his political motives and views. All three are promising kings. More often, it is not their personality and likes and dislikes that decide whether they kill people, but whether the murdered people threaten their political interests and rule. For example, Emperor Wu of the Han Dynasty killed Gou Jian's mother to prevent Lv Hou dictatorship from happening in the Han Dynasty. More often, the analysis of a politician's behavior should be based on his era and class, not on himself.

I hope my answer is helpful to you.