How to write a topic when someone spits in the elevator?

when the ground is stained with phlegm, virtue is stained. It is very immoral for someone to spit in the elevator, so we can take "a stain on the ground and a stain on virtue" as the topic. Civilization is a unique word for human beings. Speaking of civilization is the most basic moral norm that a person should abide by in contemporary society, and the slogan of civilization has played an important role in the action of creating a city with civilization.