there's a curious fact that i see getting overlooked in every one of these discussion. The US - for all its faults, remains a society capable of deep change, confronting its own crimes and one that is fundamentally built around inclusion. all this is to say that the problems of US society as documented and that one is free to read about them if one chooses.
This is not the case in the Arab world, for example. I grew up there and have seen horrors of which there is no documented evidence.
You are correct - despite all its flaws, the USA remains a magnet for talent from around the world.