The difference between these beliefs and the beliefs of religions is that scientific beliefs are methodological, not propositional...It is the absenc… - Mordechai Ben-Ari

Our existence in this world seems insignificant within the extent of space and of time. Therefore, nonreligious people have to come to terms with living in a world full of uncertainty and unknowns. Nevertheless, many people prefer facing the uncertainty, rather than believing in a certainty that makes no sense to them.

A good rule of thumb for diagnosing an activity as pseudoscientific is the existence of ad hoc explanations: “my telepathic powers aren’t working today because of a force field emanating from the hostile talk-show host.” There are no “bad-gravity days” and there are no days when your TV set stops working because electromagnetic waves feel hostility.

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.