Why do so many people complain about illegal immigrants, but so few complain about the companies that employ them?

People on the news and on the press complain about illegal immigrants stealing Americans’ jobs, and demanding that something be done about it. Yet very few people say anything about the companies that employ said immigrants. Do you think that’s the case? If so, why do you think that happens?

This is not to say that illegal immigration is either “good” or “bad”. While I’d say that the vast majority of immigrants are honest, hard-working people, it’s impossible to deny that a few bad apples also find their way across the border. Also, if there are more people willing to work, wages will come down (simple supply and demand). But are immigrants the only ones to blame for that? What are your thoughts?