No, we're walking past our own neighborhoods while the child drowns 5000 miles away. There are great philosophical arguments about the morality of the situation. I think it is immoral, however. You can start running into some slippery slope arguments about all of this (eg. is it immoral to let the vaccinated kid then fall victim to starvation? then is it immoral to let the vaccinated, "well" nourished kid go without at least a high school education? then is it immoral to let the kid grow up and die in tribal warfare?). Unfortunately we aren't even near any of that and I'd be happy to see the day where the morality lies with whether or not we have to educate a vaccinated, well nourished 3rd world child.
Oddly enough, the cultures that were interfered with the most in the past are the ones who are doing better (all things are relative of course). If we let them to their own devices, they would probably be a few hundred years away from the level we're at, at the least.