When 17-year-old Katherine Silva Lopez tried to flee gang members who robbed her daily on her way to school in Honduras, they stabbed her in the arm and threatened to kill her. In San Pedro Sula, one of the world’s most violent cities, it was no idle threat. Were 1,200 homicides last year in the city of 437,000, where gangs prey on teens. “They force you to kill, to steal, to sell drugs, to do prostitution,” Lopez told The Post in Spanish outside federal court in lower Manhattan. “I was really scared.” Lopez’s parents decided she’d be safer with relatives...