It’s pretty simple: “It’s shame your mother died in childbirth and your father from an infection. We cure those all the time… But every time we tried to help them, they attacked us, so it’s their own damn fault as far as I’m concerned.”
I’m a big fan of the Prime Directive. I say this because I have actually been to Afghanistan and I know, first hand, that trying to shape a primitive culture to conform to our standards of morality is futile. The key point is that the Prime Directive not only exists to protect the primitives from contamination by a more developed people, but it also relieves the more developed people of the responsibility of trying to solve other people’s problems. We can show them the right way to do things, we can give them examples and we can hope that they follow our lead, but at the end of the day we can’t force them to do anything unless we are willing to take on the burden of re-writing their entire culture from the floor up. And eventually it leads to the obvious question that if we are willing to invade/assist X group, why not Y? And then you end up being responsible for everyone on the entire planet.
Personally, I say, “Fuck 'em.” It doesn’t matter to me whether these people live or die. If they want to sacrifice their babies to the moon god or whatever hypothetical atrocity we’re talking about, they can have fun with that. When and if they want to change, they will change. But that is their decision to make. And if they never want to change, who cares?
I also do not believe that any such things as human rights exist. Rights are obtained and guaranteed by force of arms, and whoever has the power in any given situation has the ability to nullify whatever purported “rights” he pleases.
Any list of “human rights” (such as the aforementioned UN declaration) is an artificial thing created by imperfect humans. The UN declaration itself is not “universal” because not every UN member supports it, and many ostensible signatories treat it like toilet paper.