The Desert Mermaid

I remember that even Darwin had written things that disagreed with Social Darwinism before anyone even came up with the term. Something along the lines of how the fact that certain traits would be selected above others didn't imply that those traits were more ethically desirable, or that traits more desirable for the survival of an individual weren't always desirable for the survival of a society if they were developed at others' expense. That 'survival of the fittest' was simply a descriptive term, and not a prescriptive one. Would that this addendum to his research had been as well remembered as the rest of it.