Why did Sima Yi have to destroy the three clans of Cao Shuang after the change of Gaoping Mausoleum?

There is absolutely no room for relaxation in political struggle. Either you die or I live, and Cao Shuang will be eliminated if he doesn't understand this truth. It seems to us modern people that what Sima Yi has done is too absolute, but this is the basic principle of political struggle. Cao Shuang is an out-and-out political idiot, whose level of political struggle is far inferior to that of his ancestor Cao Cao. Why did Cao Shuang hand over military power during the Pingling coup? He naively thought that Sima Yi would give him a chance and mistakenly believed Sima Yi's sweet words.

When Sima Yi tried to kill Cao Shuang's youngest son in Military Strategy League, some people argued that he was still a child. Sima Yi said that if Cao Shuang stood here at this time, he would do the same to my grandson.

So if you just ask Sima Yi why the three clans of Cao Shuang were destroyed, I can only say that this is the principle of political struggle. Sima Yi is really rubbish, and this will definitely happen.

You can think about other examples. Don't give examples of Cao Cao and Emperor Xian of Han Dynasty. The political struggle mentioned here does not exist between Cao Cao and Emperor Xian of Han Dynasty.