Alice Miller (psychologist)  

"The collective form of absurd behavior is no doubt the most dangerous because the absurdity is no longer apparent and because it is sanctioned as "normal." It was taken for granted by most postwar children in Germany that it was improper or at least uncalled for to ask their parents specific questions about the Third Reich; often it was even explicitly forbidden. Keeping silent about this period, which represented their parents' past, was just as much a part of the "good manners" expected of children as was the denial of sexuality around the turn of the century." --Alice Miller