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You raise a very difficult ethical question in terms of others stepping in to "help". When I think of North American history and the cases where the more "civilized" population tried to "help" the First Nations peoples and Inuit, the results were far from something to be proud about. Based on this, I am more inclined to say let others progress at their own rate. However, when out-right cases of genocide are occurring, that is definitely another story.
I completely agree. Unless it's a very extreme case, like genocide as you pointed out, I think 'we' should keep to ourselves. Each society changes and progresses as it is meant to. Though some people have an idea that Westernized societies are the model societies for the world, I think that is very untrue.
I think ultimately, no matter which country in the world, it's quite sad to hear about these kinds of injustices happening to people so helpless.