One thing good television news has given us: a more nuanced view of “mobs in the street.”  Some so-called mobs are really just hired thugs en masse, others are politically inflamed people out of control. But many street demonstrations are gatherings of honest citizens expressing dissent or a specific grievance.  The year 2019 has seen a shocking number of those kinds of street demonstrations in Latin America.  Columbia University analyst Christopher Sabatini takes us around a troubled continent to see what’ explains the “mobs.”