Young people from two warring districts in the Lebanese city of Tripoli are taking to the stage in a comedy inspired by their own lives, trying to turn their backs on old rivalries inflamed by Syria’s civil war. “Love and War on the Rooftops” played to a full house in the capital Beirut on Tuesday, a rollicking play within a play about a Sunni Muslim and an Alawite district in the coastal city of Tripoli. Some locals have welcomed the project but others have accused actors from both sides of being traitors, a reflection of the daily tension between the Sunni Bab al-Tabbaneh district and the inhabitants of Jabal Mohsen, whose Alawite sect is an offshoot of Shi’ite Islam.