It is good that you admit "Some of what (agip) say(s) is sensible and reasonable." The truth, however, is that ALL of what agip has posted in this string is "sensible and reasonable." Don't agree? Point to something that isn't.
You, on the other hand, have posted nonsensical questions. The countries that you list are not denying "millions of immigrants". Countries are in general abiding my their international commitments as agip already pointed out to you. More people want to come to America than Cambodia or Turkey or . . . or China . . . We should be proud of this fact. America, along with Australia, Canada, Western Europe and a handful of others are places where people DO want to flee to. Again, we should be proud of this fact.
And if your point is "Why can't we be more like China, Russia, North Korea and just flout international conventions and commitments?" then you really have incredibly warped priorities and perspectives. Since when do Americans hold up a$$hole states as ones to model our actions on?