If you stop to think about it, or watch any of the documentaries on nature, you’d realize that nature is actually brutal and very scary. It is truly the survival of the fittest. While the developed human society has now become an economic and social survival of the fittest, it really cannot hold a candle to life based survival of the fittest.
In the animal kingdom, animals scurry for food, water, and shelter. Long famines and droughts may kill many many animals en mass. Imagine the scene if that happened to humans (which has happened many times in the past). Regardless, it is horrific. Predators will hunt their prey for food, and it isn’t pretty.