Ironically enough, it's from the holocaust museum. We now see the sins of the onetime perpetrators of lebensraum being imitated by the sons and grandsons of their victims, but upon someone else entirely! That tends to happen quite often in tbe history of humankind.

Boss yells at man. Man goes home and kicks dog. Dog bites cat. Cat scratches child. Child gives other child black eye. And so it goes...

(and they all feel totally justified in doing it too...)