When the news first hit that 22-year-old Elliot Rodger killed six students in Santa Barbara, it didn’t foreshadow the horrific details yet to come.Six promising young lives knifed and shot dead. Families instantly plunged into grief. Rodger’s film industry parents getting his 137-page biographical manifesto and seeing his threatening YouTube videos racing from Los Angeles to try and stop him, then learning of the crime and their son’s role and death on the car radio.