Grant - you are barking way down the food chain...
Gov't & Big Business love illegal labor.
They work for cheap
They have no rights
They won't use the courts
They can't file for unemployment
A few years ago ICE raided a bunch of food processing plants:
http://en.wikipedia.org/wiki/Swift_raids
and triggered a bunch of lawsuits that have strengthened the rights of illegals.
What should have been done a long time ago is a visa program that lets Mexicans (and others) to come into the country and work as long as they want, but they will never get social security and will never become citizens. Then they can come and go freely, work at whatever job they have, but eventually leave unless they become rich enough to retire here. The nuts will bitch about how much money imigrants send home, but the reality is we spend more money in one month on military adventures than all the illegal workers send home in a year - and we get waaay more in return.