You are explaining the exception to the rule. Most businesses will get caught in such an easy scam. You are also talking about illegals with skills and not the average Manuel Mexical that makes up 75% of the illegals. These guys travel from job to job and are impossible to track which is why a guest worker card could track them.
So you are for the guest worker program if they enforce the laws after they install it? That sounds like a good starting point.
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Its no exception. Ask anyone who knows how construction jobs run. They don't have to have ALL illegals doing these jobs to make a killing off the project.
The problem, at least to me, is that if they can't manage the system now, how are they going to manage a guest worker program?