Oluo reminds the reader that she’s not saying police officers are racist, hateful people. She’s saying that the people in power use the structures of U.S. society—like the media, education, and politics—to teach Americans that people of color are dangerous and need to be controlled, and they use the police force to exert that control. This system keeps people of color away from opportunity, which enables white supremacists at the top of the hierarchy to hoard power and wealth. All this comes at a tremendous emotional cost to people of color, which Oluo represents with the metaphor of wounds that haven’t healed (earlier, she used the symbol of scars to represent the same idea).