Street Photography's Snakes on a Train?

An image of a young mother in a short dress on a New York City subway raised ethical questions and the ire of some commentators on Twitter. Some found the "award-winning" photo to be stunning, while others questioned the photographer's methods – sitting across from the woman for 45 minutes while holding his camera on his lap.Unlike the conversation around "newsworthy" images and the First Amendment, street photography often occupies a much creepier and ethically ambiguous space. But what exac...