It's also extremely exploitative, the premise is actually that we will offload the burden of raising next generations and then effectively steal those that we need to prop up what would naturally be hollowing societies.

Yes, if the process works in the way it's being sold to us, it skims off their smartest, most talented and ambitious people--the people they most need to improve conditions in their own nations.

No one is stealing anything, millions willingly immigrate, they get to live better lives (according to their desires) and the home country gets back increased trade, transfer of capital, tourism, and many other things.