Perhaps a historical and international perspective might help : consider the irish immigration wave following the Great Potato Famine, and the signs : no irish need apply(for jobs). Did the irish ruin our country? Is Saint Patrick's Day any different from Cinco De Mayo? Then we have the israelis with their palestinian cheap labor-workers, a similar situation to our own cheap mexican labor-workers; and we're considering building a fence as well as the Israelis are doing. Perhaps we need a balanced approach : how to separate the wheat from the chaff : keep the good, hard working mexicans here as "wheat" and throw the "chaff" back over the fenced border. The Israelis are learning how to do it, why can't we?
The difference would be that the Irish like my Grandfather from Italy came here legally. The illegals broke our laws getting into this country, and damned if I'm willing to reward them for their actions.