The reason he mentions poetry is because poetry is commonly written with hidden meanings. The Chinese goverment tried to control all writings, but if they couldn't clearly see the meaning or thought it was something else, then they might not do anything about it.
The reason he mentions poetry is because poetry is commonly written with hidden meanings. The Chinese goverment tried to control all writings, but if they couldn't clearly see the meaning or thought it was something else, then they might not do anything about it.