I haven't read the linked article yet but I wonder if we can see a Venn diagram of the best/worst schools overlaying Republican/Democrat mayors and city councils?
Usually these things are correlated with median income levels, but I see that as another symptom of the same cause - bad government.
No doubt you're correct. The affluent in the areas dominated by bad schools can buy their way into tony private schools.
What fries my rice is that this is the root cause of inequality. All the same people who wish to "fix" inequality with hyper-progressive taxation represent a good Venn-match with the people protesting Sec.-nominee Betsy DeVos's rescuing the poor kids in the second paragraph.