Stuff like this wouldn't really be a problem if the savages weren't given access to modern western medicine like c-sections.    Their societies still live by the stone age values where you needed to reproduce young to repel high mortality rates, but instead some idiot evangelist or liberal though it was a good idea to give them healthcare thousands of years more advanced than their society is, thus ruining nature's balance, it's like a cancer, when cells start to reproduce without a stop mechanism.    Western societies grew through all that and developed and adapted to the new advancements with new values, it was a step by step process... just imagine if an alien civilization suddenly gave us technology thousands of years more advanced...    It's knowledge without the responsibility.