Just because many of us are currently troubled mostly by the incivility of Trump and his deplorable supporters, there is no reason to be tolerant of leftist intolerance. It began in the 1960s with the protests against the Vietnam war and has continued, more or less, depending on public issues, right into the present. Many not on the left have been marginalized. Many in the center left have also been marginalized as too timid and too much worried about attracting Republican voters. Incivility is common enough. Not as bad yet as the university environment in Weimar Germany, where for many years before 1933 nationalistic and anti-Semitic professors and students ruled the roost. Much the same occurred in the Poland of the Colonels, in Horthy's Hungary, in Dollfuss' Austria and elsewhere. In Stalin's Russia, of course, the same thing happened in reverse: Critics were marginalized, when they were not sent to the Gulag or simply shot in the back of the head.
In Response to: Snuffing Out Civility