@agchristie
Well, there is the ultimate in irony for you. Belief in 'bad' genes is the flipside of belief in 'good' genes and is, serpently, a re-statement of part if the culture they are so ashamed of.
I will, however, concede that sparing their potential antecedents the agony of living a life irreversibly linked to a bad ancestor is another way of looking at the situation. Practicality and pragmatism overwhelming the genetic programming which urges one to reproduce.
In the meantime, I'm mystified why the article insists on using emotive words, like 'monster' rather than clinical specifics, like "psychopathy". It is still unproven but may turn out to have a genetic basis. Their behaviour has no brakes, enabling them to do anything, with no sense of guilt, as with the concentration camp commandant example, in the article.
Actually, the ones which really bothered me were the millions of Germans who let the 1930s roll by and were too easily cowed into not speaking out against what was happening. (and cue the Ben Johnson quote…)