I'm not sure how you understand identity politics, but a diverse group of tiny sub-cultures on a "separate but equal"-platform don't create a cohesive society. There are a few points of exchange in music, food and pop culture but not much more, and any notion of assimilation gets rejected (hence the shift from "the melting pot" to "the salad bowl"). If you were to apply "divide and conquer", putting more emphasis on the differences between individuals instead of their similarities and creating lots of small groups instead of a single large one is probably a good way to create cracks.