What is “Civil Discourse”?

https://www.american.edu/spa/civildiscourse/

I have not been able to find any good resources about what the civil discourse is in Japanese.
The Link above is the content about Civil Discourse learning at AU, American University.

https://www.charleskochinstitute.org/issue-areas/free-speech-and-toleration/civil-discourse-important/

This is written by Charles Koch Foundation. Too difficult for me, but really fundamental.