Because having children makes sense if you think about it in terms of continuity. The situation it self is shitty, but livable for the children....do you know whom for which it isn't? The old and the sick. These people don't exactly have welfare, they depend on their kids to take care of them.
....and by the way, all that charity going into third world countries....it's hurting mroe than helping. All those clothes and food, are crippling their commodities markets literally depressing the price of goods and giving rise ot unemployment. The money is simply not ending up in the hands of the citizens starving on the streets....or at least nto enough to warrant a hwole bunch of white people coming into their country and using up their resources. Digging for wells is great and all, but once you're done, you'd help a lot more by just getting the hell out so their economy can stabilize.