I agree with you 100% but it's not against the law, so companies will do it for THE PROFIT.
American companies on the Line (U.S.-Mexico border) have hired Mexican women for decades, as they will even work for less than the Mexican men. Since it's not against the law, American companies WILL go for the profit.
These fat corps and others who do this have as much allegiance to the U.S. as Somalia does. A lot of things that are legal are also unethical. And since tens of thousands of employers in the U.S. hire millions of low wage illegal labor, the chances of them also contributing to and supporting imported legal low wage labor, are very likely.
I can assure you these companies couldn't careless how many Americans they put out of work, as long as they get their low wage labor $$, be it legal or illegal. No allegiance, zero. And they pay *big* to make sure these corrupt politicians keep these dangerous chain immigration polices intact. But I'm very confident you'll be seeing some big changes in the future focusing on these country killing reckless policies that only our enemies love.
Regarding this immigration/business climate, right now this is all about profits regardless of consequences. No?