Cal State antisemitic protest gets out of hand, but nobody was arrested?

President of the University suggests that the students are no longer welcome on campus.

So these rioters:

• Assaulted three people.

• Caused overwhelming destruction of the building.

• Overturned cars to barricade the entrance.

• Had to be physically removed by police officers.
  

Now when the police arrived and removed them, why were they not arrested? I get that the President (who was inside the building and basically held hostage) doesn't want these student back, but how is it that we just allow this behavior to take place over and over and over again while rarely holding anyone accountable.

Then when they do (as they are doing in Columbia) press charges, then the left has a fit about it. Our double standards of how we treat protesters and rioters is getting out of hand.