Doesn't nearly this entire concept lean toward violating the concept brought up in the third citation, "Civility Is Never Neutral"?

To me, it sounds like you're opening up a path to mark any conversation a fair number of people don't want to have as "a demon seed/thread" and then raising the bar higher on anyone being allowed to discuss such a thing at all. The ultimate outcome is just a chilling effect on controversial speech and (likely) an entrenchment of existing biases.