If you want to know why businessmen employ illegal aliens, all you need to do is look at the laws that liberals have enacted.
http://www.eeoc.gov/laws/practices/inquiries_citizenship.cfm
The above basically turns the Simpson-Mazzoli law signed into law by President Reagan, which prohibited employers from knowingly hiring illegal aliens, into a "Don't Ask, Don't Tell" law. Libs feared:
http://en.wikipedia.org/wiki/Immigration_Reform_and_Control_Act_of_1986
So the teeth were extracted from Simpson-Mazzoli.
So you libs pass the laws and then demonize those you that you've compelled to follow them. Now we're at the stage where an employer can't ask job applicants if they're illegal aliens, but if they are and you hire them, you're in trouble. IOW, the whole system is crashed and non-functioning.
Normally at this point I'd call you a typical liberal hypocrite. But you're a special case. You've repeatedly proven yourself to be a monumental tower of ignorance, so I genuinely believe you're completely ignorant of the subject. I'll be interested now to watch and see if you continue to spew this same blather like Desh does, or if you use it to learn and grow.