[A4ET8a8uTh0_v2]

I think what parent is referring to is the simple fact that the management making the decisions to hire illegal immigrants are rarely ( as in effectively never ) brought on any kind of charges despite it being ostensibly against the law. What we end up with a system, where companies get highly malleable ( and replaceable ) workforce afraid to raise a complaint and zero consequences for people making the actual decisions.

edit: A cynic would argue that the system is in place is working exactly as designed.