It is tolerated because they’ve literally wrapped themselves in the figurative cloak of love, peace, tolerance, civility.
That’s how the left can call anyone who disagrees with them haters, all debate as uncivil.
The irony is their now literal violence in the name of fighting intolerant, how they hate the haters and are moving from hate mobs online to cost you your job to attacking people.
See recent attacks on Milo Yianapolis on his dangerous faggot tour, one recently where the college made him pay for extra security and then told security to stand down as SJWs stormed the stage and threatened the speaker.
Ben Shapiro events go from shouted down to alarms pulled to roughhousing by liberals of conservatives such that security has to sneak the audience in two at a time.
Laura Southern having pee poured on her head while she’s on camera, because she is critical of liberalism and feminism.
You have described liberal fascism to a “T.”
And the historical evolution is set forth here. These liberal fascist are nothing new, they were the scourge of Europe in the 1920s onward:
Barrack Obama: The Quintessential Fascist ( historical analysis)
http://www.americanthinker.com/2009/05/barack_obama_the_quintessentia_1.html