Curious is the current emphasis on women’s trauma in American genre film—the way it’s discussed online, marketed, singled out in the headlines—as if trauma were not already deeply embedded in the historical fabric of horror movies. Of course, in a time when more women filmmakers than ever are being given the opportunity to tell their stories, the rise of feminist horror should come as no surprise, especially given the #MeToo phenomenon and efforts to destigmatize mental illness. “The Blazing World,” is one of several films playing this year’s Sundance that might call itself “feminist horror.” But it’s also the weakest, and its failures are a reminder that genre trends—even those rooted in social progress—are prone to eating themselves hollow.