Realistically, you would end up with with ten thousands of serverly traumatized adults, that would likely not be a big contribution to society at all. Most of them would probably resent their upbringing.
Think about it, first they have to endure the terrors of war and their own escape, then they get forcefully seperated from their families by a country that is supposed to be safe, while their family, parents, grandparents, uncles, aunts and likely older siblings get sent back, perhaps facing death.
I'm all for immigration and integration, but that plan is a recipe for disaster.
The only way to deal with these people is to treat them with respect and a stern hand. It's a blancing act, but it's entirely possible to do.
First the randomness of who gets to stay and who gets deported has to be sorted out though. I've seen too many well integrated, hard working people being deported (/narrowly averting it) while all sorts of scumbags and criminals get to stay.







