Do white folks REALLY want Mexicans, or Puerto Ricans, or African Americans to assimilate into their race/culture? What does assimilation mean anyway?
If it means speaking English, shopping at the mall, and watching the Dallas Cowboys, then I would say that all of these folks are doing just fine. Peaceful coexistence is all I expect from my fellow Americans. I really don't care if folks choose to segregate themselves into neighborhoods/cafeteria tables/cliques.
Assimilation is the author's term, though I'm sure he'd agree with you. But he is also talking people (many of whom are foreign nationals) actively seeking anarchy and takeover. I believe he is using "assimilation" here much in the same way another journalist would call a 99.1% Latino school population "diverse." The PC verbiage obscures the message.
These self-segregated neighborhoods often Balkinize large areas. Recently the LA Times reported attempts by Latino gangs (cliques?) to ethnically cleanse Compton of blacks by means of violence. Do I care if they choose not to "assimilate" in this instance? Hell yeah!
I've witnessed these acts of arrogance and stupidity closer to home and on a personal level. I had to contact the police on several occasions in the past when a neighbor made it obvious his actions were intended to aggravate or intimidate me into moving. And guess what? I'm still here! HE moved!