We have teachers with degrees in Social Studies and art teaching math. Guess what, the students don't learn as much math as they should. Now, we would not dream of allowing a doctor or a nurse to practice without a license, but we regularly send poor children to classrooms where the teacher has not met minimum preparation requirements. And we do this in schools serving Black and Brown kids, not in the middle class suburbs. Racism does it greatest damage in our institutions, like schools, where often well meaning people preserve a seldom examined social structure which benefits some people while harming others.
Schools teach ideas.
The ideas they choose to teach are selected by text book writers, state authorities, and teachers. Teachers and textbooks promote either an ideology of racism or pluralism, an ideology of either equality or of inequality. The current schools promote continuing the society as it is, stratified and unequal. The campaigns such as California's Prop. 209, led by Ward Connerly, to eliminate affirmative action set back efforts to create a more diverse teaching force. And to bring the wisdom of the cultural centered knowledge to serve our children.