Who is responsible for police violence at UC Davis?

The Occupy movement at UC Davis was initially about the connections between the privatization of the university and income inequality in society at large. The pepper spraying of students has shifted the discussion to police brutality, the policing of the Occupy movement, and who should take responsibility for the attack. The question that underlies these is: why isn’t the answer simple? Why doesn’t responsibility lie with the administrators who have the authority (and the paychecks) to run the university?