he moves on to the lecture part of the class , discussing the concept of doubling , or being two different people at once-the good wwii german dad who eats a civilized dinner with his family at a formal table and reads bedtime stories to his children before he kisses their foreheads and tucks them into bed , all after spending the entire day ignoring the screams of jewish women and children , gassing away , and heaving corpses into awful mass graves .