According to Darwin, there is a ruthless struggle for survival and an eternal conflict in nature. The strong always overcome the weak, and this enables development to take place. The subtitle he gave to his book The Origin of Species, "The Origin of Species by Means of Natural Selection or the Preservation of Favoured Races in the Struggle for Life", encapsulates that view.
They'll make a show of religion, but behind the scenes they're animals. Stay clear of these people!