What is there a shortage of in the US ?

Indeed.

You are aware that the college made themselves available for that speech and it wasn't the students who were violent, right? As a matter of fact there's a lot of talk about those involved in the violence being alt-right thugs looking to manipulate certain types of people. If that turns out to be true, looks like they succeeded.
BTW...I'll assume you missed the story about what happened at the Univ. of Washington last week at the con man's speech. Yeah...a Trump and Yiannopoulos supporter shot a man in the stomach.