Nebraska is desperate to stop the runaway growth of its prison population, but doing so depends a lot on people like Ronald Tillman. Tillman, 54, a paroled drug dealer who suffers from bipolar disease and a debilitating back injury, has lived since his 2013 release solely on his monthly $733 disability check. When his food runs short, he faces a choice that has costly implications for the state — if he gets caught. “Sometimes when you need food, you have to steal it,” said Tillman, a Navy veteran. “I’ve shoplifted a couple of times, just to eat that night and...