Hundreds of protesters snaked through Manhattan Tuesday in a rowdy demonstration that hit every ritzy university that has erected encampments in the past two weeks — with rally leaders threatening that administrators “should be” scared of their students. The “Flood the Encampments for Gaza” march started at New York University, where some clueless students admitted last week they had no idea what they were rallying over, before moving on to The New School, FIT, Columbia University and City College. “We have made it clear to the institution what the only appropriate resolution is. And we will not de-escalate, we will...