Sorry to play the devil's advocate, but what do you guys expect?
If the U.S. political system wasn't so self-serving, corrupt and biased, then this problem wouldn't be a problem at all.
The Mexican/Mexican-Americans are playing the political game as best they can, using whatever resources they have available. Politics is politics. What do you expect them to do, give up? Play by "the rules," even though playing by "the rules" won't get them very far?
Like it or not, they are trying to do something for themselves, since no one else will do much for them. How can you blame someone for that?
It's not fair the average U.S. citizen that various mobs, corporations and political entities have an incredible amount of power over their lives, and yet abuse that power regularly. And the average citizen apparently doesn't do much about it, either. But now when this groups wants in, all of a sudden it's a big problem that their (political) group is seeking power.
They didn't make the game or the rules, they are just playing their hand as best they could.
I don't agree with foreigners entering this country illegally, but the blame (and anger) needs to be placed exactly where it belongs: With our leaders, laws, lawmakers and other government agencies that have allowed this situation to continue to spiral away from their control.
Toppling governments halfway around the world is OK, but doing something about your neighbor's notoriously corrupt government is not important?