Free market, man. These things happen. If they're willing to work for less, they haven't destroyed the market. They've merely changed what employers can expect, and when employers start expecting people to work for a pittance like the migrants do... well, you'd either better adapt or find a new business.

The alternative would be to regulate the economy more. It limits the free market to punish corporations who hire illegal immigrants, but if it's better for the economy overall, I'm happy to see it done. The problem is people who're so stuck on their starry-eyed love of the free market that they can't stand to see it regulated... even when it'll work to solve the problems they gripe about.

Again, my personal problem here is not that people find the effects of immigration on the economy undesirable. I just get sick of hearing it from people who also claim to be all about a deregulated magically-self-correcting free economy.