A retired police officer, the 86-year-old mother of a former fire commissioner, an anti-gun activist and a longtime missionary were among the 10 people shot and killed in Saturday’s racially motivated attack at a Buffalo supermarket. A total of 13 people were shot, 11 of them Black. Authorities arrested Payton Gendron, 18, of Conklin, New York, in connection with the shooting. A manifesto allegedly written by Gendron describes the ZIP code where the supermarket is located as having “the highest Black percentage that is close enough to where I live.” Police have identified the victims of the sh…