Charis E. Kubrin is a criminology professor at UC Irvine whose work focuses in part on marginalized communities, crime and hip-hop (she co-wrote a book, “Rap on Trial,” about rap lyrics’ use in criminal cases). … “Social media can make violence appear to be increasing, even if data say it’s not,” Kubrin said. “But on the other hand, it’s a big mistake not to acknowledge that we need to be responsive and care about this. … Celebrities are targeted because they are good targets — they’re rich and famous,” Kubrin said.