Did PG-13 change horror films, or just change us?

‘Gremlins,’ ‘The Sixth Sense’ and horror’s ever-shifting relationship with mainstream cultureby Court Mann SALT LAKE CITY — When Crazy Ralph told the teens of Camp Crystal Lake that they were, in his words, “all dooooooomed!,” it was an understatement. He and his “Friday the 13th” counterparts leveraged the horror genre’s biggest trope — vulnerable teens…