To brand evolution as “just a theory” is the finest compliment one can confer on it! - Mordechai Ben-Ari

Science has also been analyzed by sociologists, political scientists and literary critics, who make little or no effort to understand the scientific subjects that they are analyzing. These critiques, known under the umbrella label of postmodernism, are seen by scientists as uninformed and pernicious in their effects on the real problems that arise in the relationship between science and society.

Concise and coherent is not the same as “simple and obvious.”

Social Darwinism and eugenics are unscientific in two aspects. First, they commit the naturalistic fallacy, which is the assumption that what is, must be. The fact that the natural environment selects for reproductive advantage does not mean that we, as humans, should be forcibly selecting people according to some preconceived notions. The second nonscientific aspect of these movements was their narrow interpretation of the meaning of fitness. In evolution, this simply means fitness to survive and reproduce, not fitness according to some externally imposed criteria.
Darwin himself never engaged in these speculations, nor did he support these perversions of his theory.