Sure, you can blame them both. Like many things multiple parties are responsible for the issue. But one group, in this case, is tacitly (and sometimes explicitly) inviting the other into the US to participate in the illegal job market. So, at least from my perspective, that puts a larger portion of the blame on the employers. They're also (along with enforcement agencies, again focusing on the employers) the only ones in a position to meaningful reduce the illegal job market.
Actually fine these businesses, threaten them with being shutdown and actually shut the worst offenders down. They're probably in violation of quite a few labor and tax laws as well, beyond just the issue of who they hire.
Actually fine these businesses, threaten them with being shutdown and actually shut the worst offenders down. They're probably in violation of quite a few labor and tax laws as well, beyond just the issue of who they hire.