welcome the stranger
"Welcome the stranger" (i.e., illegal aliens)
One of the religious justifications offered by those who support illegal immigration is their contention that the bible contains multiple exhortations to "welcome the stranger". Religious leaders transmogrify that into a command to support people moving to the U.S. at will. For the religion-based answer, see this and this. There isn't a non-religion based answer that I know of, but those who make this argument can be discredited in other ways based on simple morality. See the false compassion discussion.