ID (intelligent design) is essentially a total failure of the imagination; just because you do not see how something could have evolved, doesn’t mean… - Mordechai Ben-Ari

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.

Enormous resources are invested in pseudoscience that could be better invested in improving the health and education of the public.

The statement “I don’t see how X could have evolved” simply means that you cannot see how X evolved, not that X could not have evolved.