Why Can't Corruption Be Completely Eradicated?

A reply to a Zhihu question. Question link: https://www.zhihu.com/question/2048504760140052014.

The asker asks: "Can official corruption be completely eradicated?"

Question description: The more society progresses and the more reasonable the system becomes, the less room corruption has to survive.

Society is not actually progressing, but regressing,

My reply on Zhihu was deleted, so I am recording it here.