Along with the "war on Christmas", illegal immigrantion seems to be the other thing that's getting "conservatives" into a tizzy these days. I'd agree that people coming to this country to receive welfare isn't a good thing. But I fail to see the problem with people coming to America looking for a job. Many of them are paying taxes and propping up the social security system, and not receiving any benefit from it. As evidenced by the political bowing and scraping that "conservative" leaders do to the social security system, they ought to be viewing the "contributions" by illegal aliens to be a good thing. Furthermore, many illegal immigrants are sending US dollars south of the border. Students of economics will recognize that if those dollars never return, it is a counter-inflationary. Which is also a good thing.
Immigration isn't a problem in regards to private property. Private property owners can exclude anyone they like from their property (or at least they ought to be). If someone doesn't want Hispanics, Blacks, Jews, Catholics, or Homosexuals on their property, then so be it. On the other hand, if someone wants these groups on their property, then by the same token, they ought to have the opportunity to extend them an invitation. There is a group of private citizens who have banded together in the Southwest to keep trespassing illegal aliens off their property. Ironically, conservative darling Sean Hannity sandbagged the leader of this organization on his syndicated talk show in November 2002.
Given that people ought to have freedom of association and a right to use one's property as one sees fit, it would follow that immigration is a problem of "public" resources. In other words it is a problem that is a result of the government having control of far too much land and resources.