*yawn* Your argument is full of the same emotional semantics that got Africa into the state it is today in. "We have to save the dying children!" "It's up to us to help the babies!" "The parents aren't good enough to do it so we have to!" "They're too savage to stop their babies from dying! We have to civilize the savages!"
These children are intended to die. That's how nature goes. First, you live in a natural, nomadic lifestyle with high infant mortality. Thus, you have lots of children. Also, your lifespan is shortened, so more people, the better.
Then you progress to an agriculturally based society. Now your birth rates start to fall, naturally, as infant mortality decreases. Even so, your population expands over hundreds of years, and your culture evolves to suit it.
Then you hit the part where you're only having 2-3 kids, because you've entered the modern era with medical care, where those children will each reach 60 or so. Now you don't need to have even as many as 5 kids to ensure that they'll all live.
Finally, you reach the point where you only have 1 or no children, because there's no real need. Kids are more for pleasure than reproduction, pleasure and pride. As a result, the population begins to decrease. This is starting to occur in Germany, Sweden, Holland.
So if you have a culture that is only barely removed from stage 1, thrust into stage 3 or 4 medical technology without the culture or understanding to voluntarily reduce their childbirth rates, you get what has happened in Africa and southeast Asia - massive overpopulation almost overnight.
This leads to a whole series of problems. Like desertification, overfarming, pollution, mass poverty and hunger. You have to remember that we don't know how long it took for people to settle into agricultural lifestyles from nomadic ones. It took the Natives of North America something like 15,000 years to start forming empires, like the Olmec Empire and its successors the Mayans and the Aztecs. We think it took about the same for the first civilizations to pop up in the Mesopotamian regions.
These people just cannot handle our immunizations, our medicine, our practice or our culture, and what right do we have to continue to foist it upon them?