Not all survivalist forums are National Socialists/..... but some are, and those get their history (as did Hitler) from some of the American Progressives who are held up as icons in the liberal movement today.
History News Network | The Horrifying American Roots of Nazi Eugenics
"Even the United States Supreme Court endorsed aspects of eugenics. In its infamous 1927 decision, Supreme Court Justice Oliver Wendell Holmes wrote, "It is better for all the world, if instead of waiting to execute degenerate offspring for crime, or to let them starve for their imbecility, society can prevent those who are manifestly unfit from continuing their kind
. Three generations of imbeciles are enough." This decision opened the floodgates for thousands to be coercively sterilized or otherwise persecuted as subhuman. Years later, the Nazis at the Nuremberg trials quoted Holmes's words in their own defense."
wiki: Margaret Sanger - progressive
"As part of her efforts to promote birth control, Sanger found common cause with proponents of eugenics, believing that they both sought to "assist the race toward the elimination of the unfit."[85] Sanger was a proponent of negative eugenics, which aims to improve human hereditary traits through social intervention by reducing the reproduction of those who were considered unfit.[86] Sanger's eugenic policies included an exclusionary immigration policy, free access to birth control methods and full family planning autonomy for the able-minded, and compulsory segregation or sterilization for the profoundly ......ed.[87][88] In her book The Pivot of Civilization, she advocated coercion to prevent the "undeniably feeble-minded" from procreating.[89] Although Sanger supported negative eugenics, she asserted that eugenics alone was not sufficient, and that birth control was essential to achieve her goals.[90][91][92]
Sanger's writings echoed ideas about inferiority and loose morals of particular races that were widespread in the contemporary United States."
Margaret Sanger - Wikipedia, the free encyclopedia