Those are definitely things that helped build this country, but one of them - massive brain drain from developing countries - (and by the way, you missed from Soviet countries) - is based on the fact that there's something appealing about living here. Some folks like to call that freedom, or a set of ideals about how we structure things.

I agree with the parent comment that lately people are really down on the US and capitalism, and others are super positive about it in unthinking response. Capitalism has provided a lot of amazing things - avocados are always available! - but also done damage and been destructive.

Similarly, America was the experiment and inspiration for modern democratic/republican governance, and a major component in the beginning of more freedom for more people, while also having been built on slavery, the killing of natives, massive environmental devastation, and other terrible things.

The world is really complex, and simplifying things to good or evil tends to lose a lot of reality.