The families of three college students stabbed to death by a 22-year-old before he gunned down three more victims said the U.S. health and legal systems valued the rights of the mentally ill over those who become their victims. Police said Elliot Rodger, the son of a film director, stabbed the students in his apartment on May 23, before shooting and killing three more victims in the town of Isla Vista near the campus of the University of California at Santa Barbara. He then shot himself. "The system is clearly broken. It should have protected our sons, who were so...