I think the reason is very simple. After usurping the throne and establishing the country, the Western Jin Dynasty did not bring any glory to the Chinese people. On the contrary, the "Five Husbands" caused the Han people to almost suffer disaster. This is the most important thing. reason.

There are many usurpations in history: such as Wang Mang usurping the Han Dynasty, Yang Jian replacing the Zhou Dynasty, etc. There are many examples of a large number of powerful officials replacing the previous dynasty. During this period, there were countless intrigues, swords and blood shadows, and many people were also beaten. The label of "unjustly winning the country", but most people in the Jin Kingdom hate the Sima family. I personally think there are many reasons:

1. Cao Wei, who was usurped from the throne, seemed to have a lot of backbone. He was not as weak and dim-witted as many emperors in the late dynasties, which aroused people's sympathy.

When Sima Yi's son Sima Zhao was in power, he continued to eradicate dissidents, which aroused the dissatisfaction of Wei Emperor Cao Mao, who was already a puppet. He decided to take a desperate risk and went into battle to kill Sima Zhao, leaving behind an eternal saying. "Everyone knows Sima Zhao's heart."

Cao Mao was the first emperor in Chinese history to go into battle naked and assassinate a powerful official with his own hands, but he failed. Although he failed, his unwillingness to be manipulated by powerful officials angered countless puppet emperors, making many people feel sympathy and dissatisfaction with Sima Zhao accordingly. In particular, "Sima Zhao's heart is known to everyone", which completely nailed Sima Zhao to the pillar of shame.

2. After the founding of the country, the Western Jin Dynasty brought disaster and great humiliation to China. This is the most important reason.

The Western Jin Dynasty unified the Three Kingdoms, which is a great achievement. If it develops healthily, it should be praised by the world like the Qin Dynasty and the Sui Dynasty. However, the Eight Kings Rebellion first occurred within the Western Jin Dynasty, which brought huge disasters to the people, and then the surrounding barbarians took advantage of it. Now, the dark "Five Barbarians Rebellion" appeared. The capital of the Western Jin Dynasty was attacked by the barbarians, and the royal family was captured. It almost happened in advance. "Jingkang's Shame".

More importantly, these barbarians occupy the northern Central Plains, which is the birthplace of the Han people for thousands of years. As a result, the northern Han people became subjugated slaves under the iron heel of the foreign race, and the Chinese civilization was annihilated.

In addition, the Five Hus and Sixteen Kingdoms caused the division of China for more than 200 years, which was also caused by the Western Jin Dynasty. During this period, wars continued and people were devastated, which cut off China's development. It was really a tragedy, and it was a tragedy that the Han people could not bear to look back on.

Many of the other powerful and treacherous ministers who usurped the throne in history caused temporary harm, and some were talented and strategists who made huge contributions to Chinese history, so their disgraceful side was washed away or ignored. But the Western Jin Dynasty of the Sima family was an exception in these two aspects, so people despised and even hated them.