The jest is that by having two disparate groups so close to each other, it encourages an us versus them mentality that discourages community members from embracing some of the attributes of the other group (in the case of my essay it would be education, because I write a lot about the different ethos that students had depending on which region they lived in).
Regardless I believe your points still have a large amount of merit. Especially the last which points out how those that are fortunate tend to alternate between fads of 'caring' for various less fortunate groups, in this case it is that of East Palo Alto.