Survival of the fittest....physically, mentally, etc, should be the law of the world. Mother Nature is the perfect model.
Example: ISiS, The rat backing the tiger into the corner. All the political rhetoric in the world
won't stop them. They need to be destroyed before they destroy us. If that makes us savages so be it. Better to be a live savage than a dead wuss.
Evolution isn't all bad. Would you want a dinosaur shitting in your lawn, or eating your kid?
When a scumbag breaks thru your front door, are you going to talk and pour him a glass of wine, or shoot him?
Ethics, non- violence, sympathy, empathy, humanitarianism........all great ideals in a utopian world, but in case you haven't realized it yet, this isn't a utopian world and never will be.