Primarily because there's a line around the block to teach in a suburban school, and NYC had issues finding qualified black and Hispanic people to teach. DoE pays better than the alternatives, so until they find a rich husband, they're going to have to teach somewhere to pay back their student loans and then pay for a down payment on a home.

With that said, the school in question doesn't have a good reputation, and it's zoned for mostly black, Latino, and South Asian working class neighbourhoods. So add in some rabblerousing activist students, social media, some Muslim kids,  and black kids who are unlikely to have philo-Semetic views and you this level of lobo in a high school.