I don't think that's a necessary implication for wanting to open up immigration. All that's needed is that new immigrants should do significantly better than they did in their home country, and do some good in the country they've moved to.
All that's needed is that new immigrants should do significantly better than they did in their home country, do some good in the country they've moved to.
Notice that your two assumptions nearly contradict each other. After all if the average citizen of the old country was as capable of doing good as the average citizen of the destination, the old country wouldn't be the kind of place one needs to leave to do significantly better.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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