The political prosecution of Daniel Penny in New York City may have failed, but the chilling effect it will have on public safety, especially in the subway system, will resonate for years.Penny is a former U.S. Marine who found himself in the same subway car as Jordan Neely, a mentally ill homeless man with a history of violence. According to witnesses who were in the same car, Neely was acting erratically and saying things such as, “Someone is going to die today,” and “I want to go to Rikers. I want to go to prison.” Penny put Neely in a...