By Chris CasteelStaff writerccasteel@oklahoman.comDemocratic presidential candidate Beto O’Rourke on Monday toured the sites of two Oklahoma massacres that he attributed to the kind of hatred and racism still dividing the country.“I’m learning from the people of Oklahoma, learning from our past to make sure we are safer and more secure,” O’Rourke told reporters after touring the Oklahoma City National Memorial & Museum.Earlier Monday, O’Rourke visited the Greenwood section of Tulsa, site of the 1921 race massacre in the area then known as Black Wall Street.O’Rourke, a former U.S.