Indeed, social Darwinism provided a pseudo-scientific justification for the American belief in laissez-faire (with the successful businessman epitomizing the survival of the fittest); for eugenics (the deliberate attempt to breed superior individuals, on the model of horse-breeding, and prevent the “over-breeding” of the unfit); and for the eugenic-cum-racial theories of Nazism.
事实上，社会达尔文主义为美国人的自由放任信仰（成功商人即生存下来的适者）、优生学（按照育马模式有意识地选育超级个人，防止不适者的“过度繁育”）以及纳粹的优等人种理论提供了伪科学的论据。