We're essentially offloading the cost of raising people from childhood and much of their education to get fully grown workers who will accept lower wages. This in turn becomes a Ponzi scheme that no doubt has economic benefits but is also unsustainable without ever increasing immigration and does produce negative externalities (inflationary plus social disarray).

Also, even if we are on board with this reverse colonialism, are all immigrants contributing to the same degree? Surely the benefits could be maximized...

The government’s red ink is our black ink. The trouble is “safe savings” doesn’t have the same air of doom about it.