Zierre McManus was an adolescent in 2012 when gunfire erupted during a youth soccer tournament at the Wilmington park next to his home. That burst of violence at Eden Park, which saw spectators return fire against two shooters, left three people dead — the event organizer, the getaway driver and a 14-year-old player caught in the crossfire. “It makes me sick but in the city, we’ve been dealing with violence” for decades, McManus said last week while visiting Eden Park with his father. In the aftermath of the latest bloodshed at Eden Park, one high school canceled a junior varsity game that had been scheduled at the field last week. While those figures are on a pace to be the lowest in several years, the latest Eden Park murder — in broad daylight at a crowded sports event on a Sunday afternoon — has Wilmington politicians and community leaders stunned, angered and wondering what can be done to stop the mayhem.