>Because they're intelligent, work hard and have strong family ties.

So when imported workers are having strong conservative values prioritizing their family over progressive values = good, but when western locals are having strong conservative values prioritizing their family over progressive values = bad?

>But these things dissipate within a few generations of living in the US

Have you heard of the amish? Or the ultra orthodox jews? Or other such groups with strong conservative values. You underestimate the stubbornness of certain cultures to adopt american/western progressive liberal values. They can stay conservative longer than you can stay alive.

And also, given their significantly higher birth rates of their culture and religion, they'll also be able to outvote liberals who have catastrophically low birth rates, within a few generations. What do you think happens then with liberals and their values in a democracy?

>hence the need for more and more foreign workers.

Even when the locals are struggling to find jobs?

The elites in the West don't actually have an understanding of what they're doing. If your point is that it would be better if they promoted traditional values and invested in the native population, yes it would be, but that requires a whole metaphysical framework which elites in the West don't have.

> Have you heard of the amish? Or the ultra orthodox jews?

Yes and Western elites do not think like the Amish or like Orthodox Jews, they do not spend their time studying the Bible or care about that at all (they don't even study the Western classics).

> Even when the locals are struggling to find jobs?

They don't care about this, again this requires a whole metaphysical framework, at most they care about their own families and you'd probably be surprised at how dysfunctional these people are in their own private lives