It looks like we're mostly on the same page then. I understand the value of civil discourse; I come from a conservative family and I had openly fascist friends in university. Me, my parents, and those friends didn't find much to agree on, but I came to a better understanding of my own beliefs through our exchanges. When somebody says "I can't read X" or "I can't listen to Y," it's usually to their detriment.

But liberal high-mindedness has its limits. I personally draw mine at architects of mass murder. I don't think refusing somebody like Kissinger a platform has to indicate a trend towards incivility, since most humans--no matter what they believe--haven't killed thousands of people.