the most mysterious human being of the century

In a New York Review of Books review of Mailer's latest, J.M. Coetzee goes deep:

The class photograph test—What will be the destinies of these children? Which of them will go the furthest?— has a particular pointedness in the cases of Stalin and Hitler. Is it possible that some of us are evil from the moment we leave our mother's womb? If not, when does evil enter us, and how? Or, to put the question in a less metaphysical form, how is it that some of us never develop a restraining moral conscience? In regard to Stalin and Hitler, did the fault lie in the way they were reared? With educational practices in Georgia and Austria of the late nineteenth century? Or did the boys in fact develop a conscience, and then at some later time lose it: were Iosif and Adolf, at the time they were photographed, still normal, sweet lads, and did they turn into monsters later, as a consequence perhaps of the books they read, or the company they kept, or the pressures of their times? Or was there nothing special about them after all, early or late: did the script of history simply demand two butchers, a Butcher of Germany and a Butcher of Russia; and had Iosif Dzhugashvili and Adolf Hitler not been in the right place at the right time, would history have found another pair of actors, just as good (that is, just as bad), to play the roles?