This doesn't make any sense. Chaotic massacres perpetrated by fired-up raging mobs and undisciplined armies are very different from bureaucratically planned and systematically organized mass killings such as those done under the Nazis or Bolsheviks. While I can see some sense in asking how authoritarian aspects of culture and upbringing were relevant in cases of the latter sort, it's entirely misleading to lump them together with the former. If the quoted summary is accurate, the described work is likely just bullshit tailored to support the author's preconceptions.