I am going to pretend my previous post was poorly written so as not to offend your sensibilities.
When political activists, regardless of who they are and what they're against, want to ban a meeting because someone they disagree with is going to make a speech there, when they invade a venue with bullhorns so loud people have to leave, when they're sending death threats, or starting physical altercations, or setting things on fire, they're not behaving like progressives or conservatives, but like fascists. Regardless of what side of the aisle they're claiming to be from. Physical suppression of opposing speech is in fact textbook fascism.
There are legitimate ways to protests people and ideas you disagree with in a democratic society: boycotting an event. Writing against it. Picketing or demonstrating/counter-demonstrating. Rest assured you don't have to give them any trophy.
But what adults do is, and I know this is going to sound shocking, they talk to each other. Noam Chomsky debated William F. Buckley. William F. Buckley debated Gore Vidal (and famously lost in the eye of the nation by precisely failing to uphold civilized discourse). Malcolm X debated Martin Luther King Jr, and Martin Luther King Jr debated James J. Kilpatrick. Here in 2017 Cenk Uygur debated Ben Shapiro (...yes, this does not have the same ring to it as 1960s debates).
It is quite embarrassing that, almost 60 years ago, Doctor King could debate a segregationist on live television, while a visible segment of today's youth is reduced to hysterically yelling into a bullhorn (or worse) until people are forced to leave, just because of the perceived slight that someone is going to give a speech.
As a European who knows political trends tend to spill over across the ocean (both ways. We're still sorry for having given you a case of Acute Thatcherism, America), I am quite worried to see fascists not being opposed and denounced by the left simply because this time they are advancing under the mask of progressivism.