The problem with LA, is not only the "south of the border" population isn't assimilating, but neither are the Armenians (who have literally taken over Glendale), and some other ethnic groups/immigrants. You have a "melting pot", but the problem is, no one is "melting/assimilating".
You have ethnic communities fighting against others (especially in the gang communities). It's not just black and mexican gangs there. Include Oriental and Armenian in that game. And the unfortunate (well, one of many) things are, that each ethnic gang will teach the other of their "tricks." (this was told to me by a gang task force PD officer). Oriental gang members are infamous for following home someone and robbing/killing them in the driveway. Well, the others are catching on.
Back to illegal immigrataion....Many of the Armenians are also here on the public dole. They bring the family from "the old country" and the elders are on Medicaid/Medicare. It stinks. And they are *extremely* inclusive. Recently they asked the LA Diocese for their own Catholic Church, because they wanted to be amongst themselves (kind of defeats the purpose of catholic=universal).
It's bad. Very bad. And when these groups (illegal) make their own rules, it's a dangerous combination. We had the riots there in '92, but that will be like a Sunday BBQ compared to what can potentially erupt there. Thats why I'm quite comfortable away from there now.