In short: it's bullshit.
Oh, the poor little wogs, they lead such brutal lives, it's so sad that there are so many of them, if only there were fewer of them the world would be a better place. This is the sub-text that I see underlying these comments. It's "surplus population" crap yet again.
These are people. People with dreams and ambitions. People with lives and families. People who are capable of amazing things if given a chance. They're not just grubby uneducated unwashed masses. These are folks who will build the world of the 21st century, who will help lift their own countries out of poverty. These are people who will build fusion reactors, and space ships, and nano-technology. People who will cure cancer, create art, and music, and literature. They don't need people who think that they are wastes of resources, all they need is a chance, and just enough help to start building their own futures.