dlbert

I guess you can ignore Charles Darwin's On the Origin of Species – in his Principles of Biology (1864)

Dictionary definition Survival of the fittest,
a 19th-century concept of human society, inspired by the principle of natural selection, postulating that those who are eliminated in the struggle for existence are the unfit.
Maybe you concepts should be extinct also, it is alright for dogs to kill cats, but if a cat kills something it is evil.