Representative Jamaal Bowman (D., N.Y.) says, on Twitter:

I am outraged by the level of police presence called upon nonviolent student protestors on Columbia and CCNY’s campuses. As an educator who has first hand experience with the over-policing of our schools, this is personal to me.

Far be it from me to gainsay a man who speaks from experience; Bowman, of course, already knows of easier ways to get people to evacuate a building.