I sometimes visualise the ongoing cycle of racism as a moving walkway at the airport. Active racist behaviour is equivalent to walking fast on the conveyor belt. The person engaged in active racist behaviour has identified with the ideology of White supremacy and is moving with it. Passive racist behaviour is equivalent to standing still on the walkway. No overt effort is being made, but the conveyor belt moves the bystanders along to the same destination as those who are actively walking. Some of the bystanders may feel the motion of the conveyor belt, see the active racists ahead of them, and choose to turn around, unwilling to go to the same destination as the White supremacists. But unless they are walking actively in the opposite direction at a speed faster than the conveyor belt—unless they are actively antiracist—they will find themselves carried along with the others.
– Beverly Daniel Tatum, Why Are All the Black Kids Sitting Together in the Cafeteria?: And Other Conversations about Race (2003)