In the ancient history of our country, there are many examples of powerful ministers playing with power and overstepping emperors, that is, people often say "blackmailing the Son of Heaven to order the princes". The most famous is Cao Cao during the Three Kingdoms period, who controlled liu xie, the emperor of Han Xian, by his side, and used Emperor Xian of Han to give orders to the princes, becoming the lord of the world, and then slowly growing his own power, and finally unifying the north and establishing the state of Wei.

So in the last years of the Sui Dynasty, the powerful minister Yu Culture and also controlled the government, why did he not emulate Cao Cao to blackmail tianzi to order the princes, but killed the Sui Emperor? There are two main reasons for this, one is that the Sui Dynasty was shaken, the Sui Emperor had been tyrannical for a long time, and he had no credibility and naturally had no use value; the other was the situation at that time, killing the Sui Emperor was more conducive to yu culture and security and development.
(1) The Sui Dynasty was shaken, and the Sui Emperor had no use value
In the last year of the Sui Dynasty, the Sui Emperor said "I dream of Jiangnan good", so he decided to build the Beijing-Hangzhou Grand Canal and carry a dragon boat to Jiangnan to play. This also caused the entire imperial court to follow him to Jiangnan, requisitioning millions of people to serve the emperor, and its tyranny was no less than that of the Qin II period.
Subsequently, the peasant revolt broke out in the world, and the group led by Dou Jiande, Li Mi, and Wang Shichong rose up. When the dragon boat sailed to Jiangdu, the rebel army met here and prepared to intercept and kill yang Guang, the Sui Emperor. At this critical moment, Quan Chenyu culture and launched a coup d'état, killed the Sui Emperor, and established himself as emperor.
At that time, the Sui Dynasty's rivers and mountains were already in turmoil, and the Sui Emperor's holy will had no effect. Moreover, the Sui Emperor had been practicing tyranny for a long time, and everyone in the world had long since departed from morality and no longer regarded the Sui Dynasty as the orthodoxy of the world. Therefore, for Yu Wenhua and the Sui Emperor, the Sui Emperor has no use value, he can not give orders through the Sui Emperor, it is a burden to carry around, only by killing the Sui Emperor can he stabilize his position and power and make himself a real leader.
(2) Killing the Sui Emperor was more conducive to his own security and development
Another important reason for Yu Wenhua and the killing of the Sui Emperor was to ensure their own safety so that Xu Tu could develop in the future. At that time, the greatest threat to the ruling organs of the Sui Dynasty was the Eighteen-Way Anti-Wang Attack, and their goal was only one, that is, to kill the Sui Emperor and overthrow the rule of the Sui Dynasty.
Therefore, if Yu Wenhua and the Sui Emperor's life are retained, they will inevitably continue to encounter all the anti-king attacks, and they are likely to be destroyed by the anti-king. Under such circumstances, Yu Wenhua and only by killing the Sui Emperor could it be possible to stop the attack of the anti-kings, make themselves a prince like all the anti-kings, stabilize their own power, and at the same time, in the future, together with other anti-kings, they would chase the world.
These are the two reasons why Yu Wenhua did not choose to blackmail tianzi to order the princes, but chose to kill the Sui Emperor. Yu Wenhua and his choice are indeed correct, and this is his only way out. However, the anti-kings hated not only the Sui Emperor, but also the culture of the traitorous Xiangyu. Therefore, Yu Wenhua and the act of killing the Sui Emperor did not stop the anti-kings from attacking, and soon after, Yu Wenhua and his soldiers were defeated and killed, and his dream of being an emperor was also put to the water.