O'Tink, I loved your joke...and then, was thinking about WHY we all know immediately how it is funny...quite moving...
I cannot find a reliable reference right now so not totally certain of these facts, but I read once that Alice Miller (1923-2010, THE DRAMA OF THE GIFTED CHILD) was one of several psychologists/psychoanalysts who, after WWII, attempted to discern from a psychological viewpoint how Nazism could get away with as much as it did...she herself being of Polish-Jewish heritage...
The nearest I could find was this, from Wikipedia: "According to Alice Miller, worldwide violence has its roots in the fact that children are beaten all over the world, especially during their first years of life, when their brains become structured."
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Anyway, you posted a joke and I got kinda heavy here...