Friedman isn't being especially perspicacious here; free immigration plus welfare means you will attract those most in need, that is, those who take more than they give, from across the world. Individual cases may vary, but the incentive is thus. https://twitter.com/Static_Rage/status/1044918917884514304 …
this is just to say arguing for immigration based on the quality of past immigrants has a reflexivity problem. You can certainly argue to continue a certain immigration policy based on the results, but expanding it must necessarily change those numbers.
