You cannot negotiate with a mob. The money quote starts at 1:31 in the clip:
"All of it began the first time some of you who know better, and are old enough to know better, let young people think that they have the right to choose the laws they would obey as long as they were doing it in the name of social protest."
If you want to quote the Declaration of Independence in your protest, you'd better win. Ben Franklin said it best: We must all hang together, or assuredly we shall all hang separately.
I'm sure those college students thought they were right. I do not. And in many cases today I don't think college students are right, either.
Update: I hope this is more widespread than you might think after watching all the riot footage:
After a violent protest forces UC Berkeley to cancel a speech by right-wing provocateur Milo Yiannopoulos, students wonder what has become of an institution known as the birthplace of the Free Speech Movement.