what to do about ethnic cleansing

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…groups, that distinction will be made, and as long as that distinction is made, there will be a few warmongers who will take advantage and cause bloodshed. Although the madness of a few people will not always spread, once in a while it will go out of control, leading to a massive genocide such as in Germany and Rwanda. And when there is another massive wholesale destruction, what will the world powers do about it?