This week, the country has echoed with thoughts about whether or not the tone in politics these days has created a hostile issue. The opinions on extreme speech are one thing. Looking at the actual evidence of what's happening in society (or not) is another.
In part three of our series on this issue, CNN Radio's Lisa Desjardins looks at the recent tone in the U.S. and asks an expert in extreme speech how something like general hostility could possibly be measured.
Arizona State Professor Steve Corman responds that in society as a whole, it's difficult, but he points to new ways researchers are picking up on trends.
We also ask, are people who are prone to violence usually triggered by specific issues and words that matter to them or by the tone of speech in general?
Corman's answer: "It's more the manner in which debate is conducted than, I would say, the issues."
Click here to listen to part three: