It's the same thing with immigration really. They say immigration is to help people, when in reality only a lucky few gets picked to live a new life while the rest is left in misery and despair. And the resources spent on immigration could be used to help a much larger number of people if we just trashed the immigration idea and focused on localized help organizations.
Wrong, immigration is actually beneficial in the country in many, many cases. Nations that support immigration have historically had strong and diverse economies.
Nations that had a multicultural/dense population/high immigration have included the USA, Britain and the Netherlands. The latter two are more significant in that despite having a poor amount of land with which to farm and a lack of natural resources, they still became global powers at some stages in time.
Edited:
This is actually a very real thing in our future. You know, if Teddy Roosevelt doesn't come back by then ticked off at what has happened to the world, but anyways, if that ever happens I'd suggest making it illegal to have more than 1 child, whether the child is successfully born ( Say if you have an abortion, or the child acquires a heart defect and turns out to be a stillborn ) or not, so over time the population would go down slowly. Very slowly. Or we could attempt to colonize Mars before that happens, but if we don't and the 1 child plan fails it's time to castrate some guys. Oh man, our future is going to be so messed up.
No no no. Not only is that infringing on multiple human rights, but:
The birth rate is declining. Some nations EVEN have a negative population growth.