The issue is a bit more complex than that (and I doubt middle management has a firm enough grasp on how to let go 10,000 people within a shot-time frame with proper diligence). There is a vested interest in deregulating the immigration system because it will drive down skilled labor costs, not filling "open" positions allows them to perpetuate their agenda at no cost to them (outside of a job listing). Anyone who has to work under the threat of deportation is going to work harder on average than someone who isn't. It's good for productivity, but bad for all the skilled labor in this country, INCLUDING the people who want to immigrate here for a better life, because they'll be subjected to it eventually too.
