"Are eco-terrorists who threaten public safety tampering with energy infrastructure OK?"

Nope.  Been a while since we've had a lot of those, realistically.  And the handful of self-appointed 'antifa' protesters are equally not ok, but don't constitute a defence for the actual, right-wing racists who are out there in numbers.

You're quick to slag off a professor as a "champagne socialist in an urban ivory tower" without ever knowing his voting patterns or political views.  It's not "socialist intervention" to insist that some views -- which by their nature constitute hate speech -- are unacceptable.  Or do you see them as acceptable?