Moreover, details of the potential solution of that [psycho]historical mystery may lead to the discernment of possible improvements to that existing psychohistorical theory -- in this case, a Marxian psychohistorical theory regarding a potentially embarassing and revealing incident within the strategy and tactics of the ‘descendence phase’ capitalist ruling class.
The 'Rockefeller Crime[s-Against-Humanity] Family', and the Rockefeller Foundation, funded “eugenics”, including, especially, in America, and in Germany, where it morphed into Hitler's “eugenics” concentration/extermination camps, etc.
The Rockefellers, fearing a potential alliance between Germany and Russia that could overthrow the Rockefellers' 1930s-emerging world dictatorship, had assigned Hitler to attack Russia and Eastern Europe, and to enslave and exterminate the Slavic peoples ["Generalplan Ost", and "Operation Barbarossa"]. The Rockefellers intended this to lead to the mutual destruction, or, at least, to the profound weakening, of both Germany and Russia.
The Rockefeller plutocracy no longer talks openly about “eugenics”, ever since Hitler turned against them -- as signaled in Hitler’s 1939 “Peace Pact” with Stalin -- whereafter Hitler endeavored to wrest world domination away from the Rockefellers, into his own hands, instead of continuing to be their ‘Servant-Dictator. With Hitler thus become Rockefeller enemy number one, for the wrong reasons -- as well as enemy number one of all decent human beings, world wide, for the right reasons -- Hitler's defeat led to the post-WWII world wide public revelation of Hitler’s “eugenics” camps [and other] horrors.
The very word “eugenics” then became anathema, among all decent human beings world wide.
After WWII, the Rockefellers had to switch to their "People Are Pollution" perversion of the grass roots anti-pollution movement as cover for their continued pursuit of “eugenics” global 'humanocide'.
During the prelude to WWII, the Rockefellers had also been grooming “eugenicist” Charles Lindbergh to become their U.S. ‘servant-dictator’, after their planned overthrow of the Roosevelt presidency -- and had therefore also been cultivating his vast U.S. [and world-wide] celebrity and popularity -- up until he fathered a “genetically defective” son.
The latter event disqualified the “eugenicist”, Lindbergh, in the eyes of the Rockefellers, from representing the Rockefellers’ “good genes” ideology as to who should rule, and who should die.
Lindbergh had his “genetically defective” son kidnapped and murdered in March 1932, hoping, thereby, to suppress press coverage of his son’s “genetic defect”, and to get back into the “good graces” of the Rockefellers, so as to once again be their choice for their U.S. ‘servant-dictator’, after their overthrow of the Roosevelt regime.
Evidence of Lindbergh's involvement in the kidnapping of his own child is presented in the following PBS NOVA episode [original air date 31 July 2013; from time-index ~37:35 to time-index ~44:17] -- https://www.youtube.com/watch?v=EOc_gztk2E8 -- and in a major book on the kidnapping by Rutgers historian Lloyd Gardner [Lloyd Gardner, The Case That Never Dies: The Lindbergh Kidnapping].