There doesn’t seem that much ambiguity in Scripture. I don’t recall anywhere where Jesus says “And you have every right to throw strangers out of your country.”
The parable of the Good Samaritan would suggest the precise opposite, that Jesus believed Christians should aid all people, regardless of their origin.
It may not be a policy, but it’s a pretty darned good place to start. Herding them into what amount to prisons doesn’t exactly sound like a Christian solution to me.
I fail to see the fallacy. Irish and Italian immigrants were often treated pretty badly by Americans (in fact, the slang for Italian Americans; “wop”, comes from “without papers”). And yet Italians and Irish that immigrated to the US ultimately integrated into American society, so all the warnings that these strange people and their alien beliefs would undermine the US was nothing more than dressed up prejudice.
Why would anyone take all the risks of leaving their homeland, their families, their way of life, if not to seek better economic conditions for themselves and their family? Do you have some statistics on the number of illegal immigrants whose intentions are nefarious?
They have the rights and dignities that go along with being human beings. It’s a pity you seem to seem them only as pests.