We’re learning more about the victims of the Buffalo supermarket massacre. Aaron Salter Jr. is being praised as a hero. The 55yearold worked security at the store, and opened fire on the gunman before being shot to death. Ruth Whitfield, 86, was a grandmother of eight who sang in her church choir. And 72yearold Katherine Massey was a wellknown civil rights activist who wrote a letter to a local newspaper last year condemning gun violence.