Socially, natural selection argues that the best and fittest society would be one where its' individuals look out only for themselves and would advance themselves, if possible, at the expense of others. It would even destroy others if possible. Thus barbarianism is demanded by natural selection with the destruction of the weak and the free domain of the powerful. It demands total annihilation of anything weaker than necessary and the ruling of anyone more powerful than others.
People exhibit mercy, pity, and morality, all of which inhibit natural selection.
The natural selection process could not have the forethought to allow an organism to become worse temporarily in order to ultimately form an eye, for example. Natural selection requires that organisms began as crude, yet an organism could not have survived without basic intricate functions such as respiration and reproduction. These had to exist from the beginning of the organism. A system dependent on order cannot be created by disorder. Socially, natural selection requires barbarianism.