By some measures, Jacksonville was making strides to emerge from its racist past. But the killing of three Black people by a young, white shooter was a painful and startling reminder that the remnants of racism still fester in the Florida city. What happened Saturday in Jacksonville, said 79-year-old longtime resident Rodney Hurst, “could have happened anywhere, except it did happen in Jacksonville.” The shooting occurred as the community prepared to commemorate what is known as Ax Handle Saturday, when a white mob used baseball bats and ax handles to club peaceful Black demonstrators protesting segregation at a downtown lunch...