Just as summer is ramping up, Myrtle Beach, a top South Carolina summer destination, is dealing with a flurry of violence that has city and state officials scrambling to calm worried visitors and residents. In the city's most prominent incident, at least seven people were injured in a June 18 shooting that was live-streamed on Facebook. That shooting -- and two others that weekend -- followed six over the Easter holidays in April. The violence prompted South Carolina's Republican Gov. Henry McMaster to visit the city not long after and order steps to beef up security, such as bringing in...