Did I miss something? The New Orleans maps show soil lead levels and income levels. Even if these maps were to show correlation (it's not clear they do), and ev

Did I miss something? The New Orleans maps show soil lead levels and income levels. Even if these maps were to show correlation (it's not clear they do), and even if they suggested causation (which is anything but clear), we would need to see a crime rate map to even get at the question the article deals with. The maps are pretty. What are they meant to show?