Vandalism like this isn't the answer, but it does provide a glimpse at what's in store when people-- and that's what they are, people-- feel persecuted, terrified, and pushed to the limit:
This country has a history of being driven by fear, anger, and hate, most recently, via BushCo's attempt to scare us into submission with their obsession with a war on a word (terrorism). Muslims became the enemy, even though only a fraction deserved the label "terrorist".
Now we have an African American in the White House. As a result, we also have hate-mongers and racists who are so terrified that their majority white comfort zone is being pulled out from under them that they attack anyone who is "different".
Dangerous armed militias are becoming more and more prevalent. Who will protect us from those nutcases? Pfft, it's much easier to target immigrants, make them the scapegoats. They don't "belong". They're "different". They must prove that they are American.
Now the "different" are starting to retaliate.
How about targeting illegal employers? How about writing constructive immigration laws that make sense rather than demanding birth certificates from anyone who strikes law enforcement as "illegal"?
Let's try to remember that we live in America, the land of the free and the home of the brave, not the land of the harassed and the home of the cowardly. Let's remember that E pluribus unum ("Out of many, one"), was once considered our de facto motto... not, "Where are your papers?"