News of the killings traveled across the country, far from the small southeast Nebraska city where the gruesome crimes unfolded. Two men stalked Brandon Teena, a 21-year-old transgender man, before raping and killing him. They then killed two witnesses in an attempt to conceal the slaying. The events in 1993 inspired the film “Boys Don’t Cry,” but it was a documentary released one year earlier that helped spark a national debate over hate and v…