TAKE A WALK down the Suburban Station steps to the patio at 16th Street and JFK Plaza and you'll find yourself in a wasteland of wasted humans and human waste. There's pee on the patio. Pee on the walls. Pee in the hot summer air. And something much stronger than a pee smell emanating from one fly-swarmed corner. Poop. What used to be an oasis of planters and picnic tables for SEPTA commuters is now a thoroughly-trashed hobo camp where the homeless eat, sleep, urinate and defecate amid their bedrolls and their junk. Inside the Suburban Station concourse, commuters can...