This is the result of a decade of social justice classes teaching people that society is horrible, as bad as the 1930s, and they are required to take action by silencing the speech of others as well as disrupting events held by conservatives.
When you have millions of young people who think it is their moral duty to end freedom of speech, freedom of assembly and freedom of belief in the name of justice, you get a lot of people afraid to say anything to get mobbed online, attacked physically by liberals SJWs or a car keyed (at best).
The root cause is liberals tarring conservatives as haters, bigots, evils. They label speech they hate as hate speech, demanding it be banned and prohibited even in conservative gatherings . And they call it hate speech because it lets them deny that the opposing views have a logical basis while simultaneously demonizing the speaker as bad and irrational.
This is fascism in the name of feelings by cry-bullies, who cry victim if you don't roll over and apologize but threaten violence against Trump supporters and conservative speakers for merely speaking. And that's totally separate from the racist BLM calling for the deaths of all white males or mocking that they bathe in male tears, blatant sexism.