Bill de Blasio, the progressive-minded mayor of New York City, the city with the greatest mass transit ridership in North America, rode a train today.

The men and women of New York's transit workers union are inheriting the worst impulses of their friends at the NYPD. After a city bus driver was arrested last week for running over a 15-year-old girl in a crosswalk—delivering injuries so serious that she may lose her leg—the union complained that the city was treating bus drivers like "criminals." In this case, that's because one of them committed a violent crime.