Stop and think about that for a moment.  Why should a bunch of corrupt politicians and bureaucrats be able to keep you from living in the country of your choosing?  Or make you jump through hoops for the honor of legally settling there?

All good theoretical stuff, but, unfortunately, reality has a way of overwhelming theory, and the dominant reality of our age is that a significant number of the earth's inhabitants believe they have a right to violate your freedom.  I'm not just talking about political thugs and bureaucrats, but their envy-crazed followers as well.  Thus, the reality of illegal immigration is that it has the potential to destroy a civilized country.

That said, if the United States were to declare undocumented residents ineligible for any form of government assistance, that would be a reality that would change everything.