“More to the point, one cannot understand The Holocaust without understanding the intentions, ideology, and mechanisms that were put in place in 1933. The eugenics movement may have come to a catastrophic crescendo with the Hitler regime, but the political movement, the world-view, the ideology, and the science that aspired to breed humans like prized horses began almost 100 years earlier. More poignantly, the ideology and those legal and governmental mechanisms of a eugenic world-view inevitably lead back to the British and American counterparts that Hitler’s scientists collaborated with. Posterity must gain understanding of the players that made eugenics a respectable scientific and political movement, as Hitler’s regime was able to evade wholesale condemnation in those critical years between 1933 and 1943 precisely because eugenics had gained international acceptance. As this book will evidence, Hitler’s infamous 1933 laws mimicked those already in place in the United States, Britain, Norway, Sweden, Finland, and Canada.
So what is this scientific and political movement that for 100 years aspired to breed humans like dogs or horses? Eugenics is quite literally, as defined by its principal proponents, an attempt at “directing evolution” by controlling any aspect of human existence that affects human heredity. From its onset, Francis Galton, the cousin of Charles Darwin and the man credited with the creation of the science of eugenics, knew that the cause of eugenics had to be observed with religious fervor and dedication. As the quote on the opening pages of this book illustrates, a eugenicist must “intrude, intrude, intrude.” A vigilant control over anything and everything that affects the gene pool is essential to eugenics. The policies could not allow for the individual to enjoy self-government or self-determination any more than a horse breeder can allow the animals to determine whom to breed with. One simply cannot breed humans like horses without imbuing the state with the level of control a farmer has over its livestock, not only controlling procreation, but also the diet, access to medical services, and living conditions.”

Source: H.H. LAUGHLIN: American Scientist. American Progressive. Nazi Collaborator.