The death of Jordan Neely reveals a wide societal belief that “any homeless person is likely to be violent or likely to attack them,” one expert said. Protesters gathered on crowded subway platforms across New York City and marched down city streets in the days after a subway rider killed Jordan Neely, 30, by placing him in a chokehold for several minutes on a train in the middle of the day. Advocacy groups and Neely’s supporters are demanding justice, requesting social services for people with mental health issues and calling attention to local policies that, they say, further marginalize unhoused...