efc1127a,
I have never said that the US has a moral duty to welcome all those who come here.
I think that the harboring statutes are overbroad and, in many cases, immoral.
You and I have been around this block before -- well, not this specific one maybe, but ones very much like it.  We disagree about immigration law.  
You were at the other table in the courtroom, and our points of view are very different.  Neither of us will convince the other.