Question

how were the ideas of darwin and herbert spencer adopted by hitler or nazis explain

Answer 1

Darwin and Herbert Spencer developed the notion of evolution to explain the development of organisms in the biological world. This was associated with the idea of the survival of the fittest in which animals which are able to adapt to the environment best survive and propagate. Such ideas were appropriated by the Nazis to justify their genocidal policies against Jews, Slavs and Russians. They argued that just as in the biological world, among human societies too, only the fittest survive. Those who are weak and unfit should be eliminated. According to them, Jews and other Eastern Europeans were subhumans and not fit to survive. Hence, they were justified in murdering them.