DaveP said:
If there was a country that practiced open borders and prospered, then we would all copy the principle but there are none.
Well, within the EU borders were essentially open to other member-states, at least in Schengen, and that "worked" without creating pure criminal chaos, which is what you implied. So if you begin to widen that zone of free movement you must sooner or later end up with an area inhabited by people that are somehow not capable of living in law and order, according to your argument. In other words, "we" are capable of it, and "they" are not.
The problem with that argument is that it lives in a bit of a vacuum in my opinion. I mean, I actually understand what is implied there and I don't totally disagree with some of it, but it leaves out our own actions. In other words, while "they" come to our lands and misbehave at a supposedly larger rate than "we" do, what do "we" do abroad? What policies do we support that affect "them"? I would essentially maintain that "we" are no better than "they" are when we take international actions into account, it's just a matter of means and scale. From a US standpoint its essentially entirely hypocritical to support the crimes of nation-states against other nations while then complain about the dangers of foreigners entering the country. It obviously doesn't mean that I'm in favor of the latter, just that I think it's a hypocritical stance.
So from a philosophical and moral standpoint I think I can understand that there's an objection to be had, while acknowledging that there are real practical problems to be solved.
DaveP said:
Just because some cultures do not practice birth control and consequently have to export their surplus population, does not mean that we are obliged to be responsible where they are not.
DaveP
It's pretty much clear as far as I know that having many children is to a very large degree dependent on wealth, education and freedom. Unfortunately said wealth really have an effect on education and freedom, so really a lot of it has to do with just wealth. China is an interesting example, but it isn't entirely applicable because it really is an exception. The one-child policy was fine but we saw the effects of the very same basic problem of poverty in that the children given up for adoption were mostly girls or boys with birth defects or illnesses, and now China has a problem with too few girls.
Generally speaking though the issue should then be seen in a much broader context. Are "we" at all responsible for the lack of wealth in the nations in which birth rates are really high? Again I would argue that we are. So there is at least an indirect responsibility.