From what I've come to understand, there are two types of people who favor illegal immigration: those who directly benefit from it such as those who hire them, and those who are not affected by it such as the elites who live away from it, whose jobs are not affected by it, and whose children attend private schools or at least schools which are not overcrowded with illegals' children.
I concur, and I also think that many times the same people fall into both categories simultaneously.....they would be the wealthy owners of corporations/businesses who simply view cheap foreign slave labor as their means to make even more $.