The Consitution was written (according to, you know, the Preamble) to secure the blessings of liberty to ourselves and OUR posterity; not the posterity of anyone/everyone from every Third World country who the Demcrats can jam through the door.
Culture matters; people who were raised in authoritarian or non-Christian countries, are not going to have it "in their bones" what the Bill of Rights mean; since for them rights come _from_ the government.
Blah, blah, blah