Only the very small businesses that operate in cash without books and without filing IRS returns operate that way.
If any labor intensive type business files a return that shows labor cost far below the norm they will get audited. Failure to pay withholding taxes is the first thing the government will send someone to prison for.
Where do you get the idea that illegals don't want to be legal? They would love to have green cards.
My experience is helping someone get citzenship the legal way tell me her utter disgust for her fellow south american bretheren who she told me mostly despite this country and everything about it. I will take the word from the horses mouth.
She told me that they don't want to assimilate, don't want to be on the books to pay taxes, and could care less about illegal border crossings.
Furthermore, she told me about how many ways they scam the social service "safety" net that we all pay for. Its a crime. Either they become legal the legal way with financial sponsors or they should be out immediately.
If they cannot find two financial sponsors, than they should be gone and none of us forced to pay for them, their kids educaotion, welfare, health benefits, reduced tuition, etc etc.
Finally, "not all cultures are equal" is the truth. Of course people will be offended, but can you honestly say that modern Islamic Culture or Third World culture is equal to western culture?