A country has a responsibility to the people already there (especially citizens) first. As long as you have people starving, who need help and money, etc, accepting NEW people who also need help is kind of a kick in the nuts.

If you take in more people, it's because it is in the best interest of the people currently there.

That might mean as a way to grow the economy, as a tax source, maybe even just as a general way to increase happiness because existing citizens like it. Maybe it's to ensure the country's reputation among other countries.

But you don't let people in just for shits and giggles unless everyone already there are fed and happy. And that never happens, so...