Make no mistake, this is the administration at Columbia University refusing to testify, not the actions of the prosecutor.
The administration can't testify against the "protestors" because the protesters were taught such behavior at Columbia University, and that would all come out in court.
Columbia University has been a breeding ground for anti-American and anti-white male vitriol for a century. The administration was only upset that their monsters turned on them. They would have been fine with their monsters attacking others.
Columbia certainly has a very spotty, sullied record when it comes to equal rights and moral values
some rotten leadership
as the olde Scandinavian proverb put it,
“a fish rots from the head”