Isn't this just evolution, or Darwinism in action? In other words, removing all empathy and emotions aside, is this not just the natural order of things. The life cycle if you will. Famines happen, natural disasters occur, living things move around. On a human level, yes there are other inputs and stimuli that may contribute to disaster etc too. War, politics, economics etc..
Whether AIDS, cancer, small pox, bubonic plague, influenza, whatever, there will always be something that "culls" the human herds just like diseases that affect the flora and fauna of our planet.
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