We Need to Talk About Kevin isn’t the first film this year to outlast its immediacy. A novel written by Lionel Shriver in the wake of the Columbine school killings, director Lynne Ramsay has been trying to make the film since her last feature, Morvern Callar, in 2002. The unusually long gestation period has stripped the story of its ripped-from-the-headlines quality. It now plays like a quaint, violent memory. These are the under-parented demon children of not so long ago