How to treat Cao Zhi's usurpation of Han and Sima's usurpation of Wei?

Historically, Cao Zhi didn't hate usurping the Han Dynasty so much, but he despised Sima Yi for usurping Wei. The reasons are probably the following four aspects:

The first is the source of power. Cao Wei's power was played by Cao Cao, one city and one place. The world is in chaos. Cao Cao's "holding the emperor to make the princes" was quite polite to Emperor Xian of Han Dynasty. He unified northern China and made great historical contributions. Some people criticized Cao Cao for this. In fact, as Cao Cao said, if you don't control the imperial court, how many people in the world will be kings? Cao Cao is not the only one who can "hold the son of heaven". Some people think that Emperor Xian of Han Dynasty is useless. Sima Yi took advantage of the decline of Cao Wei's royal family to seize the court by intrigue, and then seized the land of Cao Wei. His behavior is despicable.

The second is to treat the former dynasty. Although Cao Cao "relied on the emperor to make the princes", he did not harm the emperor and married all three daughters to Emperor Xian of Han Dynasty. Xelloss acceded to the throne, taking the way of abdication, sealing Liu Xieshan Yang Gong, allowing him to continue to be emperor in the fief, and still using the etiquette and service of the Han Dynasty, which did not harm Liu Xie's life. Liu Xie's country of Yang Shan existed until the Jin Dynasty. After Liu Xie's death, Cao Cao of Wei Mingdi personally led his ministers to cry and sacrifice, and was buried in the Zen Mausoleum with the ceremony of Emperor Wu of the Han Dynasty. posthumous title offered a filial sacrifice to the emperor.

Sima treated Cao Wei's royal family very viciously. Sima Yi staged a coup in Ping Ling, killing all loyal ministers of the former dynasty (Xia Houxuan, Wang Jing and others); Si Mazhao killed Cao Mao in the street, which is unique in history. After the incident, even Shu Han and Dongwu were shocked. He is a rebel thief through and through!

Third, the way to govern the country. The Jin regime came easily, so it was not so cherished. The whole Western Jin Dynasty and the Eastern Jin Dynasty were the most corrupt and worst dynasties in China's history. The rulers live a life of showing off wealth, striving for wealth and extravagance. They don't care about the sufferings of the people, and even play jokes like "Why not eat minced meat". If the descendants of Sima's family were a little more successful, their reputation would not be so bad.

Fourth, the contribution to Chinese civilization. During the Cao Cao period, the Xiongnu was dismembered and divided into five parts, attacking Wuhuan in the north and suppressing its power in the north. All ethnic minorities dare not covet the Central Plains. In the Jin Dynasty, the spirit of the Han nationality in the Central Plains dried up, which led to the chaos of the Five Dynasties, and the history of China entered the darkest period.