Consider what would happen if one took American flags to a St. Patrick's Day celebration. Riots? Loud words? Not with any Irish I know. It's one thing to celebrate your national heritage while thanking God you're finally an American!
The Aztlan/MecHa/La Raza/Maldef bunch are waging low-intensity war with this country, using Alinsky methods in concert with white anti-American radicals. The sooner the broad American public accepts that fact, the sooner we'll begin to assert our principles as a nation again. If we don't we're heading rapidly for 3rd World status.
It's strictly an economic transaction for the illegals. Some will eventually seek to become legal, but that doesn't necessarily mean that they want to integrate into society. It likely means that they don't want to live under threat of deportation.