What jobs? Nobody is hiring other than ICE.

That's the threat that American companies use to keep the thing going. Honestly, we should tax the living shit out of services done offshore, too.

That is correct. Actually an economist on NPR suggested that the main theory is that access to those workers tends enable some places (in this case the Hyundai plant) to open more locations since they can scale better.

That's not to say you can have zero rules, but it doesn't historically come at a cost the same way off shoring does (and it's usually still more expense than offshoring, though for manufacturing that's getting obvious hiccups).