It is still bad if they assimilate. Not near as aggravating as having them driving up and down your streets on "Cinco de Mayo" waving Mexican flags and letting their illegal presence be known. Or having employers in your area say "Those who are not bi-lingual need not apply".
1) Cinco de Mayo is a celebration about beating THE FRENCH! We can all agree on beating the French! What a great reason to crack a few XXs.
2) I live in Texas....former sovereign, French, Spanish, Mexican, Confederate state.....we still fly six flags here.