Peter Longerich argues that the search for a finite date on which the Nazis embarked upon the extermination of the Jews is futile, in his book Holocaust: The Nazi Persecution and Murder of the Jews (2011). Longerich writes: "We should abandon the notion that it is historically meaningful to try to filter the wealth of available historical material and pick out a single decision" that led to the Holocaust.
Approximately 30 physicians served at Auschwitz while Mengele was assigned to the camp. As a required part feature of their “rounds,” medical staff performed “selections” of prisoners on the ramp. These selections determined who from among the mass of humanity arriving at Auschwitz would be retained for work and who would perish immediately in the gas chambers.
The geographical patterns of local hostility to Jews influenced receptivity to their rescue. Thus, western Europe (France, Belgium, and the Netherlands), Scandinavia (Denmark and Finland), and southern Europe (Italy and Greece) adapted rapidly to the problems of hiding and rescuing Jews, whereas eastern and central Europe (Poland, the Ukraine, and Austria) remained a more hostile environment to rescue efforts.
If there was a caesura towards the implementation of the Final Solution through mass murder, it is marked by the German "war of destruction" waged against the Soviet Union from June 22, 1941. Provided with instructions that called for the rapid pacification of conquered areas and that stressed the "sub-human" nature of broad strata of the population as well as the need for drastic measures to fight the deadly threat posed by "Judeo-Bolshevism" to the Nazi grand design, German soldiers, SS-men, and policemen murdered Jews from the first days of the campaign. Regionally different patterns of persecution unfolded until the end of 1941; its most prominent feature – the broadening scope of the killings from male Jews of military age (Heydrich's notorious letter to the higher SS- and Police heads in the occupied Soviet Union dated July 2, 1941, listed "Jews in party and state positions" and "other radical elements" among those to be executed) to women and children – underscores the absence of a central order and the preference of the Berlin authorities for controlled escalation.
It was Yad Vashem—the institution whose name derives from the same passage in Isaiah—that first popularized the term “righteous among the nations” to refer to those Gentiles who rescued Jews during the Holocaust, often risking their own lives in the process. While Isaiah apparently had in mind Gentiles who related to God in a righteous way, and not necessarily through their relations specifically with Jews, the singling-out of Harbonah focuses our attention on those who exert themselves to protect Jews. In commemorating such people, Yad Vashem has given them, too, “a place and a name” in the original sense of that phrase.
Mengele sailed to Argentina in July 1949, assisted by a network of former SS members. He initially lived in and around Buenos Aires, then fled to Paraguay in 1959 and Brazil in 1960, while being sought by West Germany, Israel, and Nazi hunters such as Simon Wiesenthal who wanted to bring him to trial. He eluded capture in spite of extradition requests by the West German government and clandestine operations by the Israeli intelligence agency Mossad. He drowned in 1979 after suffering a stroke while swimming off the Brazilian coast, and was buried under a false name. His remains were disinterred and positively identified by forensic examination in 1985.