Part of the problem, as mentioned, is the Koch brothers and other ultra rich Republicans who value their cheap labor above all else. Just in case you thought the problem was just Democrats/liberals. Nope, you can blame Republican business assholes too. According to these Republican mega-donors, without illegal Mexicans, no fruits will get picked, no one will staff restaurants, no landscaping will get done, and no one will clean bathrooms. What they should say is that they don't want to pay a real living wage to Americans to do these jobs.